Influences of Complex Modifications on Impact toughness of Hypereutectic Al-20%Si Alloy

Liu Niu-can1; Liu zhong-xia1

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Influences of Complex Modifications on Impact toughness of Hypereutectic Al-20%Si Alloy
Issue S1, Pages: 146-148(2008)
Published： 2008 ，
DOI：

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[1]刘扭参,刘忠侠.复合变质对Al-20Si合金冲击性能的影响[J].特种铸造及有色合金,2008(S1):146-148.

Liu Niu-can1, Liu zhong-xia1. Influences of Complex Modifications on Impact toughness of Hypereutectic Al-20%Si Alloy. [J]. Special Casting & Nonferrous Alloys (S1):146-148(2008)
[1]刘扭参,刘忠侠.复合变质对Al-20Si合金冲击性能的影响[J].特种铸造及有色合金,2008(S1):146-148. DOI：

Liu Niu-can1, Liu zhong-xia1. Influences of Complex Modifications on Impact toughness of Hypereutectic Al-20%Si Alloy. [J]. Special Casting & Nonferrous Alloys (S1):146-148(2008) DOI：

摘要

在不同P、RE添加量下对P-RE复合变质和未变质的Al-20Si合金的冲击韧度进行了研究。结果表明

P-RE复合变质明显提高了合金的冲击韧度

当加入0.08%的P和0.6%的RE时

合金的冲击韧度达到最佳

合金的冲击韧度从未变质的9.7862J/cm2提高到11.0098J/cm2

提高了12.5%。冲击断裂机制主要是脆性断裂

也伴随有韧性断裂。合金冲击韧度的改善与复合变质引起的共晶硅和初晶硅颗粒的细化和合金强度、塑性的提高有关。

Abstract

The impact toughness of modified and non-modified hypereutectic Al-20%Si alloys were studied in the different content of P and RE. The results show that the complex modification of P and RE can obviously improve impact toughness of hypereutectic Al-20%Si alloy. When the tested alloys modified with 0.08%P and 0.6%RE

the optimal impact toughness of modified alloys is obtained. The impact toughness is increased to 11.0098J/cm2 from 9.786 2 J/cm2 of the unmodified alloy

increased by 12.5%.With the toughness fracture

the mechanism of impact fracture is mainly the brittleness fracture. It can be attributed to the the refinement of primary silicon and eutectic silicon particles and the increase of strength and ductibility of alloys caused by the complex modification of P and Re.