Effects of Extruding-forging Process on Microstructure and Properties of AZ81 Magnesium Alloy

Du Yong; Long Siyuan; Cao Fenghong; Chang Huanhuan

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Effects of Extruding-forging Process on Microstructure and Properties of AZ81 Magnesium Alloy
Vol. 29, Issue 1, Pages: 39-41(2009)
Published： 2009 ，
DOI：

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[1]杜勇,龙思远,曹凤红,常欢欢.挤锻复合成形工艺对AZ81镁合金组织和性能的影响[J].特种铸造及有色合金,2009,29(01):39-41+4.

Du Yong, Long Siyuan, Cao Fenghong, et al. Effects of Extruding-forging Process on Microstructure and Properties of AZ81 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(1):39-41(2009)
[1]杜勇,龙思远,曹凤红,常欢欢.挤锻复合成形工艺对AZ81镁合金组织和性能的影响[J].特种铸造及有色合金,2009,29(01):39-41+4. DOI：

Du Yong, Long Siyuan, Cao Fenghong, et al. Effects of Extruding-forging Process on Microstructure and Properties of AZ81 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(1):39-41(2009) DOI：

摘要

阐述了一种挤锻复合成形工艺。对AZ81镁合金半连续铸坯固溶处理后挤压

并在400℃下以60%的锻压比锻压

研究了其组织和性能变化。结果表明

挤压态AZ81镁合金具有较细的晶粒组织

第二相Mg17Al12被破碎

以弥散状沿晶界分布

个别呈流线形。其屈服强度、抗拉强度和伸长率分别较铸态提高了69.9%、63.2%和164.6%;锻压后

晶粒更加细化均匀

脆性相Mg17Al12被再次粉碎

部分融入晶粒内部;其各项力学性能得到较大提高

其屈服强度、抗拉强度和伸长率分别达到229MPa、337MPa和15.5%

较挤压态又分别提高了9.6%、8.7%和22.3%;晶粒细化和第二相Mg17Al12分布对AZ81镁合金的性能有着重要影响;从拉伸断口金相SEM上可以看出

铸态AZ81镁合金经挤压和锻压后

断裂单元变小

断口上的韧性部分增多。

Abstract

Microstructure and properties of solution treated semi-solid AZ91 magnesium alloy slab which was forged with 60% reduction at 400℃ after extrusion were investigated. The results indicate that fine grain size in extruded AZ81 magnesium alloy can be observed

in which major broken Mg17Al12 phase is dispersedly distributed along grain boundary with minor streamline ones. Yield strength

tensile strength and elongation of the extruded alloy are increased by 69.9%

63.2% and 164.6%

respectively

compared with those of semi-continuous alloy slab. Refiner grain size can be observed in extruded AZ81 magnesium alloy after forged treatment

in which re-broken Mg17Al12 is partly dissolved into grain. The yield strength

tensile strength and elongation of extruded AZ81 magnesium alloy after forged treatment reach 229MPa

337MPa and 15.5%

respectively

increased by 9.6% and by 8.7%

22.3%

respectively

compared with those of extruded ones

greatly improving the mechanical properties. Properties of the AZ81 magnesium alloy are closely related to the refinement of grain and distribution of Mg17Al12 phase. SEM and OM observation show that fracture morphology of extruded-forged AZ81 magnesium alloy is characterized by ductile crack.