Influence of Mixed Modification on Impact Toughness of Hypereutectic Al-20Si Alloy

Liu Niucan1; Liu Zhongxia2

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Influence of Mixed Modification on Impact Toughness of Hypereutectic Al-20Si Alloy
Vol. 28, Issue 12, Pages: 975-977(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,2008,28(12):975-977+902.

Liu Niucan1, Liu Zhongxia2. Influence of Mixed Modification on Impact Toughness of Hypereutectic Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 28(12):975-977(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,2008,28(12):975-977+902. DOI：

Liu Niucan1, Liu Zhongxia2. Influence of Mixed Modification on Impact Toughness of Hypereutectic Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 28(12):975-977(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过共晶铝硅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

也伴随有韧度断裂。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

Effects of P-RE mixed modification with different P and RE additions on impact toughness of hypereutectic Al-20Si alloy were measured

which were compared with those of ones without modification treatment.The results reveal that impact toughness of the hypereutectic Al-20Si alloy can be obviously improved with P-RE mixed modification.With 0.08% P and 0.6% RE mixed addition

compared with that of 9.7862 J/cm2 of ones without modification

the impact toughness of the alloy makes 11.009 8 J/cm2

increased by 12.5%

exhibiting desirable properties.The mechanism of impact fracture is characterized by brittleness fracture together with ductile fracture

which is attributed to the refinement of primary Si and eutectic Si phase and the increase of strength and ductibility of the alloy caused by mixed modification of P and RE.