Strengthening Capacity of AT72 Magnesium Alloy after Heat Treatment

Kong Qingfu; Wang Baishu; Kou Shoupeng; Xiong Shoumei

doi:10.15980/j.tzzz.2014.12.014

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Strengthening Capacity of AT72 Magnesium Alloy after Heat Treatment
Vol. 34, Issue 12, Pages: 1281-1284(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.12.014

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[1]孔庆富,王柏树,寇首鹏,熊守美.真空压铸AT72合金的热处理强化能力分析[J].特种铸造及有色合金,2014,34(12):1281-1284.

Kong Qingfu, Wang Baishu, Kou Shoupeng, et al. Strengthening Capacity of AT72 Magnesium Alloy after Heat Treatment. [J]. Special Casting & Nonferrous Alloys 34(12):1281-1284(2014)
[1]孔庆富,王柏树,寇首鹏,熊守美.真空压铸AT72合金的热处理强化能力分析[J].特种铸造及有色合金,2014,34(12):1281-1284. DOI： 10.15980/j.tzzz.2014.12.014.

Kong Qingfu, Wang Baishu, Kou Shoupeng, et al. Strengthening Capacity of AT72 Magnesium Alloy after Heat Treatment. [J]. Special Casting & Nonferrous Alloys 34(12):1281-1284(2014) DOI： 10.15980/j.tzzz.2014.12.014.

摘要

对真空压铸AT72合金铸态和热处理态的力学性能和拉伸断口进行了研究

与AZ91D的热处理强化进行了对比。结果表明

AT72合金热处理强化效果不明显。拉伸断口分析显示

AT72合金压铸态和时效态的断裂模式主要是沿晶解理断裂;固溶处理和固溶加时效处理的合金的断裂模式则是穿晶解理断裂

而且除了表层

心部很大部分裂纹扩展发生在缩孔、缩松处。

Abstract

Mechanical properties and fracture morphology of the as-cast and heat treated（HPDC）vacuum die casting AT72 magnesium alloy were measured and analyzed

and they were compared with those of AZ91 Dalloy.The results reveal that heat treatments can not exhibit a desirable strengthening effects on the AT72 alloy

and the fracture mode of the HPDC and T5 treated AT72alloy is mainly characterized by intergranular cleavage fracture

while the fracture mode of the T4 and T6treated AT72 alloy is mainly characterized by trans-granular cleavage mode

and most of heart cracks are propagated across shrinkages and holes besides the superficial shell for all AT72 alloys.