Effects of Ni and Zr on Microstructure and High Temperature Mechanical Properties of Al-Si-Cu-Mg Alloy

Lu Tong; Qiu Chu; Zhang Yuebo; Xue Guanxia; Song Wei; Liu Tao; Li Hutian

doi:10.15980/j.tzzz.2024.03.024

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Effects of Ni and Zr on Microstructure and High Temperature Mechanical Properties of Al-Si-Cu-Mg Alloy
Vol. 44, Issue 3, Pages: 419-423(2024)
Published： 20 March 2024 ，
DOI： 10.15980/j.tzzz.2024.03.024

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路通，邱楚，张跃波，等. Ni、Zr对Al-Si-Cu-Mg合金组织与高温力学性能的影响［J］. 特种铸造及有色合金，2024，44（3）：419-423.

LU T，QIU C，ZHANG Y B， et al. Effects of Ni and Zr on microstructure and high temperature mechanical properties of Al-Si-Cu-Mg alloy［J］. Special Casting & Nonferrous Alloys，2024，44（3）：419-423.
路通，邱楚，张跃波，等. Ni、Zr对Al-Si-Cu-Mg合金组织与高温力学性能的影响［J］. 特种铸造及有色合金，2024，44（3）：419-423. DOI： 10.15980/j.tzzz.2024.03.024.

LU T，QIU C，ZHANG Y B， et al. Effects of Ni and Zr on microstructure and high temperature mechanical properties of Al-Si-Cu-Mg alloy［J］. Special Casting & Nonferrous Alloys，2024，44（3）：419-423. DOI： 10.15980/j.tzzz.2024.03.024.

摘要

利用金属型铸造开展了Al-Si-Cu-Mg过共晶活塞合金的制备，通过Thermo-Calc软件对不同合金中耐热相的体积分数进行计算，结合扫描电镜（SEM）和透射电镜（TEM）对合金的组织进行定量金相分析，同时对合金在350 ℃下的力学性能进行测试，研究了不同Ni和Zr含量对铸造Al-Si-Cu-Mg基过共晶活塞合金显微组织和力学性能的影响，分析了金属间化合物形貌和面积分数与力学性能的对应关系。结果表明，随着Ni含量增加，Al-12.5Si-4.0Cu-1.0Mg合金在350 ℃下的抗拉强度和屈服强度逐渐增加，伸长率逐渐降低，组织中的Al

Ni和Al

CuNi相的数量增多，并且形貌由针状和棒状逐步演变成块状和团簇状，耐热相面积分数也有明显增加；随着Zr含量增加，Al-12.5Si-4Cu-1.0Mg-1.5Ni合金的抗拉强度和屈服强度先降低后升高，伸长率逐渐增大，组织中的AlSiNiZr相数量逐渐增多，并且耐热相面积分数逐渐增大。Al

Zr沿着铝基体［001］轴析出，并且与铝基体共格，形成高温强化相，通过强化铝基体提高了合金的高温强度。

Abstract

Al-Si-Cu-Mg hypereutectic piston alloy was prepared by metal mold casting. The volume fraction of heat resistant phase in different alloys was calculated by Thermo-Calc software. The microstructure of alloy was observed by scanning electron microscope （SEM） and transmission electron microscope （TEM）， and the mechanical property test was carried out at 350 ℃. Effects of Ni and Zr contents on microstructure and mechanical properties of cast hypereutectic Al-Si-Cu-Mg piston alloy were investigated， and the relationships between morphology， area percentage of intermetallic compounds and mechanical properties were analyzed. The results indicate that the tensile strength and yield strength of Al-12.5Si-4.0Cu-1.0Mg alloy at 350 ℃ are gradually increased and the elongation is gradually decreased with the increase of Ni content. The amount of Al

Ni and Al

CuNi phases is increased and the morphology is gradually tranformed from fine strip and rod to bulk and cluster， while the percentage of heat-resistant phase area is also increased obviously. With the increase of Zr content， the tensile strength and yield strength of Al-12.5Si-4Cu-1.0Mg-1.5Ni alloy are decreased firstly and then increased， while the elongation is increased gradually. The amount of AlSiNi Zr phase and volume fraction of heat-resistant phase are increased gradually. Al

Zr is precipitated along the aluminum matrix ［001］ axis， and collocated with the aluminum matrix to form a high temperature strengthening phase， improving the high temperature strength of alloy by strengthening aluminum matrix.

关键词

过共晶活塞合金耐热相显微组织力学性能

Keywords

Hypereutectic Piston AlloyHeat-resistant PhaseMicrostructureMechanical Properties

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