CN101988169B - High-strength cast magnesium alloy and manufacture method thereof - Google Patents

High-strength cast magnesium alloy and manufacture method thereof Download PDF

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Publication number
CN101988169B
CN101988169B CN201010580947A CN201010580947A CN101988169B CN 101988169 B CN101988169 B CN 101988169B CN 201010580947 A CN201010580947 A CN 201010580947A CN 201010580947 A CN201010580947 A CN 201010580947A CN 101988169 B CN101988169 B CN 101988169B
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metal
cast
alloy
magnesiumalloy
high strength
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CN101988169A (en
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尤俊华
邱克强
任英磊
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Shenyang University of Technology
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Shenyang University of Technology
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Abstract

The invention relates to a high-strength cast magnesium alloy and a manufacture method thereof. The magnesium alloy comprises the following components of 2wt% of Cu, 7wt% of Zn, 0.7wt% of Mn, 0.01 to 4wt% of Y and the balance of Mg, wherein metal Y can be not added. The manufacture method comprises the following steps of preparing materials according to the percentage; smelting Mg in a resistance furnace with a iron crucible; adding metals Cu, Zn, Mn and Y; keeping the temperature at 720 to 770 DEG C; using mixed gas of N2 and SF6 as protective gas; casting the obtained liquid metal at 710 to 750 DEG C; carrying out solid solution to the obtained products at 380 to 420 DEG C for 3 to 6 hours, and aging at 170 to 190 DEG C for 10 to 20 hours to obtain the high-strength cast magnesium alloy with the tensile strength not less than 320 MPa, the elongation not less than 5% and good composite mechanical property.

Description

Cast Mg alloy with high strength and preparation method thereof
Technical field
The invention belongs to the magnesium alloy materials technical field, be specifically related to a kind of cast Mg alloy with high strength and preparation method thereof.
Background technology
Magnesiumalloy is light-weight structural timber in the practical application, and it is low to have density, and specific tenacity, specific rigidity are high; The electromagnetic shielding ability is strong, and damping performance is good, aboundresources; Dimensional stabilizing, series of advantages such as damping and amortization, castability, machinability are good and be prone to reclaim, and be pollution-free; Be described as one of " 21 century environmental protection engineering materials ", obtain increasingly extensive application in fields such as automotive industry, communication electronic industry and aerospace industries.In recent years, magnesiumalloy annual growth worldwide is up to 20%, and application prospect is very considerable.During "the 10th five-years", China has started relevant magnesium alloy materials exploitation and industrialization work in succession in Program for Tackling Key Problems and 863 Program, promoted China's Application of Magnesium effectively.
Yet; The popularity of magnesiumalloy application in recent years still can not show a candle to duraluminum; Trace it to its cause mainly is that present magnesiumalloy also exists following remarkable shortcoming: (1) absolute strength is still on the low side; Especially mechanical behavior under high temperature is relatively poor, and when temperature raise, its intensity and creep-resistant property often descended significantly; (2) temperature-room type plasticity is low, and the deformation processing ability is relatively poor; (3) chemically reactive high, be easy to oxidizing fire, make its melting processing difficulties; Erosion resistance is poor, lacks effective and positive corrosion prevention approach.Therefore, the magnesiumalloy of exploitation HS, excellent combination property has become the important topic of nearly 20 years magnesiumalloy research fields.
In the research of high-strength magnesium alloy, solution strengthening, refined crystalline strengthening and the dispersion-strengthened etc. that magnesiumalloy mainly produces through alloying element are used for improving the performance of magnesiumalloy.The Zn element can increase fluidity of molten, has to form micro-shrinkage porosite tendency, and be weak grain-refining agent.The solid solubility of Zn in magnesiumalloy is about 6.2%, and the precipitation hardening effect is arranged, and can improve the creep-resistant property of foundry goods.In the Mg-Zn alloy, add proper amount of rare-earth element and zr element, can prepare ZE41 or ZE63 alloy.The ZE41 alloy is to use alloy the most widely in this series, after the T5 ageing treatment, in the time of 150 ℃, has medium tenacity, is usually used in the aircraft transmission housing.Therefore, the research and development of high-strength casting Mg-Zn series alloy are extremely important.
Summary of the invention
The present invention provides a kind of cast Mg alloy with high strength and preparation method thereof, its objective is the cast Mg alloy with high strength of preparing tensile strength >=320MPa, unit elongation >=5%.
The present invention implements through following technical scheme:
Cast Mg alloy with high strength is characterized in that: component in the magnesiumalloy and mass percent are: Cu 2%, and Zn 7%, and Mn 0.7%, and surplus is Mg.
Component in the magnesiumalloy and mass percent are: Cu 2%, and Zn 7%, and Mn 0.7%, and Y 2 ~ 4%, and surplus is Mg.
Tensile strength >=the 320MPa of magnesiumalloy.
The unit elongation of magnesiumalloy >=5%.
The preparation method of cast Mg alloy with high strength is characterized in that: said method is carried out according to the following steps:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn and metal M n, and according to mass percent Cu 2%, Zn 7%, Mn 0.7%, surplus is the ratio batching of Mg;
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn and Mn, 720 ℃～770 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas obtains liquid metal as shielding gas;
(3) casting: liquid metal 710 ℃～750 ℃ cast, is obtained foundry goods;
(4) thermal treatment: with the solid solution after 3～6 hours under 380 ℃～420 ℃ conditions of step (3) products therefrom, timeliness 10～20 hours under 170 ℃～190 ℃ conditions obtains cast Mg alloy with high strength again.
Said method is carried out according to the following steps:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn, metal M n and metal Y, and according to mass percent Cu 2%, Zn 7%, Mn 0.7%, Y 2 ~ 4%, surplus is the ratio batching of Mg;
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn, Mn and Y, 720 ℃～770 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas obtains liquid metal as shielding gas;
(3) casting: liquid metal 710 ℃～750 ℃ cast, is obtained foundry goods;
(4) thermal treatment: with the solid solution after 3～6 hours under 380 ℃～420 ℃ conditions of step (3) products therefrom, timeliness 10～20 hours under 170 ℃～190 ℃ conditions obtains cast Mg alloy with high strength again.
During cast, under normal casting technique, model adopts metal mold or sand mold.
The cast Mg alloy with high strength of the inventive method preparation, tensile strength >=320MPa, unit elongation >=5% have good comprehensive mechanical properties.
Description of drawings:
Fig. 1 is the stretching sample size of embodiment line cutting;
Fig. 2 is the stress-strain curve of the Mg-2Cu-7Zn-0.7Mn-3Y alloy of embodiment 1 preparation.
Embodiment:
Describe the present invention below in conjunction with specific embodiment.
Embodiment 1:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, Y 3%, surplus are Mg.
The preparation method is following:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn, metal M n and metal Y, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, Y 3%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn, Mn and Y.720 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 710 ℃ of cast, under normal casting technique, model adopts sand mold with liquid metal.
(4) thermal treatment: with the solid solution after 6 hours under 380 ℃ of conditions of step (3) products therefrom, timeliness 18 hours under 170 ℃ of temperature condition obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn3Y) tensile strength is 375MPa, and unit elongation is 9%.
The magnesiumalloy Mg2Cu7Zn0.7Mn3Y stress-strain curve that this embodiment makes is as shown in Figure 2.
Stretching samples using line cutting sampling, sample size is as shown in Figure 1, L1=40mm, L2=20mm, L3=12mm, L4=3mm, R1=4.5mm, φ 1=φ 2=3mm.
Embodiment 2:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, Y 0.01%, surplus are Mg.
The preparation method is following:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn, metal M n and metal Y, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, Y 0.01%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn, Mn and Y.730 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 720 ℃ of cast, under normal casting technique, model adopts sand mold with liquid metal.
(4) thermal treatment: with the solid solution after 4 hours under 390 ℃ of conditions of step (3) products therefrom, timeliness 17 hours under 175 ℃ of temperature condition obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn0.01Y) tensile strength is 328MPa, and unit elongation is 7.8%.
Embodiment 3:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, Y 1%, surplus are Mg.
The preparation method is following:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn, metal M n and metal Y, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, Y 1%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn, Mn and Y.770 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 750 ℃ of cast, under normal casting technique, model adopts sand mold with liquid metal.
(4) thermal treatment: with the solid solution after 3 hours under 420 ℃ of conditions of step (3) products therefrom, timeliness 14 hours under 190 ℃ of temperature condition obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn1Y) tensile strength is 330MPa, and unit elongation is 6.8%.
Embodiment 4:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, Y 4%, surplus are Mg.
The preparation method is following:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn, metal M n and metal Y, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, Y 4%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn, Mn and Y.760 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 740 ℃ of cast, under normal casting technique, model adopts sand mold with liquid metal.
(4) thermal treatment: with the solid solution after 5 hours under 410 ℃ of conditions of step (3) products therefrom, timeliness 20 hours under 185 ℃ of temperature condition obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn4Y) tensile strength is 367MPa, and unit elongation is 8.2%.
Embodiment 5:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, Y 2%, surplus are Mg.
The preparation method is following:
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn, metal M n and metal Y, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, Y 2%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn, Mn and Y.730 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 720 ℃ of cast, under normal casting technique, model adopts sand mold with liquid metal.
(4) thermal treatment: with the solid solution after 5 hours under 390 ℃ of conditions of step (3) products therefrom, timeliness 10 hours under 175 ℃ of temperature condition obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn2Y) tensile strength is 335MPa, and unit elongation is 7.2%.
Embodiment 6:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, surplus are Mg.
The preparation method is following.
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn and metal M n, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn and Mn.750 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 730 ℃ of cast, under normal casting technique, model adopts metal mold with liquid metal.
(4) thermal treatment: with the solid solution after 4 hours under 400 ℃ of conditions of step (3) products therefrom, timeliness 15 hours under 180 ℃ of conditions obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn) tensile strength is 325MPa, and unit elongation is 7.6%.
Embodiment 7:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, surplus are Mg.
The preparation method is following.
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn and metal M n, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn and Mn.740 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 710 ℃ of cast, under normal casting technique, model adopts metal mold with liquid metal.
(4) thermal treatment: with the solid solution after 3 hours under 380 ℃ of conditions of step (3) products therefrom, timeliness 12 hours under 180 ℃ of conditions obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn) tensile strength is 321MPa, and unit elongation is 7.3%.
Embodiment 8:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, surplus are Mg.
The preparation method is following.
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn and metal M n, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn and Mn.770 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 725 ℃ of cast, under normal casting technique, model adopts metal mold with liquid metal.
(4) thermal treatment: with the solid solution after 4 hours under 395 ℃ of conditions of step (3) products therefrom, timeliness 20 hours under 190 ℃ of conditions obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn) tensile strength is 332MPa, and unit elongation is 7.7%.
Embodiment 9:
Cast Mg alloy with high strength, chemical ingredients is by mass percentage: Cu 2%, Zn 7%, Mn 0.7%, surplus are Mg.
The preparation method is following.
(1) batching: raw material adopts metal M g, metal Cu, Metal Zn and metal M n, is the ratio batching of Mg according to mass percent Cu 2%, Zn 7%, Mn 0.7%, surplus.
(2) melting: adopt iron crucible, melting in the conventional, electric-resistance stove, at first smelting metal Mg treats that metal M g all melts the back and adds metal Cu, Zn and Mn.720 ℃ of control smelting temperatures adopt N 2And SF 6Mixed gas is as shielding gas, per-cent meter by volume, N 295%, SF 65%, obtain liquid metal.
(3) casting: 750 ℃ of cast, under normal casting technique, model adopts metal mold with liquid metal.
(4) thermal treatment: with the solid solution after 6 hours under 420 ℃ of conditions of step (3) products therefrom, timeliness 10 hours under 170 ℃ of conditions obtains cast Mg alloy with high strength again.
The magnesiumalloy that obtains (Mg2Cu7Zn0.7Mn) tensile strength is 340MPa, and unit elongation is 8%.

Claims (3)

1. cast Mg alloy with high strength, it is characterized in that: component in the magnesiumalloy and mass percent are: Cu 2%, and Zn 7%, and Mn 0.7%, and Y 2 ~ 4%, and surplus is Mg.
2. according to the said cast Mg alloy with high strength of claim 1, it is characterized in that: the tensile strength >=320MPa of magnesiumalloy.
3. according to the said cast Mg alloy with high strength of claim 1, it is characterized in that: the unit elongation of magnesiumalloy >=5%.
CN201010580947A 2010-12-09 2010-12-09 High-strength cast magnesium alloy and manufacture method thereof Expired - Fee Related CN101988169B (en)

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CN103981415B (en) * 2014-05-09 2016-06-15 曹帅 A kind of high damping magnesio noiseless alloy and preparation method thereof
CN104831137B (en) * 2015-05-26 2017-01-18 重庆大学 Aging strengthening type magnesium alloy and heat treatment process thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4239535A (en) * 1978-05-31 1980-12-16 King John F Magnesium alloys
CN101805864A (en) * 2010-04-06 2010-08-18 重庆大学 High-damping and high-strength Mg-Cu-Mn-Zn-Y alloy and manufacturing method thereof

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Publication number Priority date Publication date Assignee Title
CN101724772B (en) * 2009-12-16 2012-08-01 沈阳工业大学 High-strength cast magnesium alloy and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4239535A (en) * 1978-05-31 1980-12-16 King John F Magnesium alloys
CN101805864A (en) * 2010-04-06 2010-08-18 重庆大学 High-damping and high-strength Mg-Cu-Mn-Zn-Y alloy and manufacturing method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王其龙.砂型铸造Mg-10Gd-3Y-Zr合金的组织和性能研究.《中国优秀硕士论文全文数据库 工程科技I辑》.2010,(第10期),第28-30页. *

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