消失模重力铸造镁合金组织及性能研究

田学锋; 樊自田; 黄乃瑜; 吴和保; 董选普

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消失模重力铸造镁合金组织及性能研究
Microstructure and Properties of Mg Alloy in Gravity LFC（Lost Foam Casting）
2004年第5期页码：51-53
纸质出版日期： 2004 ，
DOI：

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[1]田学锋,樊自田,黄乃瑜,吴和保,董选普.消失模重力铸造镁合金组织及性能研究[J].特种铸造及有色合金,2004(05):51-53+3.

Tian Xuefeng Fan Zitian Huang Naiyu Wu Hebao Dong Xuanpu. Microstructure and Properties of Mg Alloy in Gravity LFC（Lost Foam Casting）[J]. Special Casting & Nonferrous Alloys, 2004,(5):51-53.
[1]田学锋,樊自田,黄乃瑜,吴和保,董选普.消失模重力铸造镁合金组织及性能研究[J].特种铸造及有色合金,2004(05):51-53+3. DOI：

Tian Xuefeng Fan Zitian Huang Naiyu Wu Hebao Dong Xuanpu. Microstructure and Properties of Mg Alloy in Gravity LFC（Lost Foam Casting）[J]. Special Casting & Nonferrous Alloys, 2004,(5):51-53. DOI：

摘要

对消失模重力铸造及随后热处理条件下AZ91合金组织、力学性能进行了系统的研究。结果表明 :消失模铸态下的合金除主要由初生α Mg枝晶及离异共晶沉淀相 β Mg17Al12 组成外

还存在其他工艺条件下未曾发现的新相Al3 2 Mn2 5（线尺寸为 5～ 5 0 μm） ;消失模铸态下的AZ91合金各项力学性能指标均高于树脂砂型铸态的各对应值

这可以归因于消失模铸造充型过程中存在的泡沫模冷却作用及缓冲作用 ;经过热处理后合金的综合力学性能有较大幅度的提高

均匀化过程中各元素扩散速度较慢。

Abstract

As-cast and heat treated microstructures and properties of AZ91 Mg alloy in gravity LFC were systemically investigated. As-cast microstructure of the alloy in LFC is mainly composed of primary α-Mg dendrite and divorced eutectic β-Mg 17 Al 12 as well as a new phase Al 32 Mn 25 that was not found in other technologies（ linear dimension 5～50 μm）. The mechanical properties of as-cast AZ91 Mg alloy in LFC were higher than those in resin-bonded sand casting due to chilling and cushioning effects of foam pattern during mold filling in LFC. Heat treated comprehensive mechanical properties were improved remarkably. The elements diffusion rate slowed down during homogeoization.