微量元素对AlCu4.5合金力学性能的影响

董晟全; 周敬恩; 严文; 梁艳峰; 李建平; 杨通

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微量元素对AlCu4.5合金力学性能的影响
Effects of Micro-Alloying Elements on the Quasi-solid Mechanical Properties of Al-4.5Cu Alloy
2003年第1期页码：16-18
纸质出版日期： 2003 ，
DOI：

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[1]董晟全,周敬恩,严文,梁艳峰,李建平,杨通.微量元素对AlCu4.5合金力学性能的影响[J].特种铸造及有色合金,2003(01):16-18+3.

Dong Shengquan Zhou Jing’en. Effects of Micro-Alloying Elements on the Quasi-solid Mechanical Properties of Al-4.5Cu Alloy[J]. Special Casting & Nonferrous Alloys, 2003,(1):16-18.
[1]董晟全,周敬恩,严文,梁艳峰,李建平,杨通.微量元素对AlCu4.5合金力学性能的影响[J].特种铸造及有色合金,2003(01):16-18+3. DOI：

Dong Shengquan Zhou Jing’en. Effects of Micro-Alloying Elements on the Quasi-solid Mechanical Properties of Al-4.5Cu Alloy[J]. Special Casting & Nonferrous Alloys, 2003,(1):16-18. DOI：

摘要

高强度铸造Al Cu合金具有良好的室温和高温强度

但它的热裂倾向性一直是制约其发展的瓶颈。通过对合金的收缩应变和热裂抗力及准固态力学行为进行测试

研究了微量合金元素（Ni

Mn）对AlCu4.5合金准固态力学性能的影响。结果表明

Zr合金元素能使AlCu4.5的热裂倾向性降低 ;加入质量分数为 2 %的Si会使合金的再辉现象非常严重

导致合金不可能有很高的强度而很快断裂 ;与其他AlCu4.5Si合金相比

AlCu4.5Si3合金具有很强的补缩能力

断裂应力值最高 ;La的加入能缩小二次枝晶间距

明显提高合金的抗热裂性能。

Abstract

The effects of Micro-alloying elements

in cluding Si

Mn on the quasi-solid mechanical properties of Al-4.5Cu alloy were investigated through examining contracted strain and hot crack resistance as well as quasi-solid mechanical behavior. The results showed that addition of Si

Zr can reduce the hot crack tendency of the alloy. Adding 2% Si into the base alloy

recalescence phenomenon of the alloy is so severe that the alloy has no longer higher strength resulting in rapid! fracture. Compared to other AlCu4.5Si alloy

AlCu4.5Si3 alloy exhibited very strong feeding ability and highest fracture stress value. Addition of La can reduce secondary dendrite arm spacing and improve significandy hot crack resistance of the alloy.