In-situ processing and aging behaviors of MgAl2O4 spinel whisker reinforced 6061Al composite
In-situ processing and aging behaviors of MgAl2O4 spinel whisker reinforced 6061Al composite
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DOI：
10.1016/j.msea.2013.12.086
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发表时间：
2014-03
期刊：
影响因子：
6.4
通讯作者：
Yang Zhou;N. Zhao;C. Shi;E. Liu;Xi‐Wen Du;C. He
中科院分区：
文献类型：
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作者：
Yang Zhou;N. Zhao;C. Shi;E. Liu;Xi‐Wen Du;C. He
6061铝合金基复合材料因其密度低、力学性能和耐磨性优异而受到越来越多的关注。在本研究中，制备了原位生成的 MgAl2O4 尖晶石晶须增强的 6061Al 合金基复合材料，并在 160-210 °C 的温度范围内对复合材料进行了固溶和时效硬化处理。研究了复合材料的微观结构和力学性能，并讨论了原位生成的晶须对复合材料老化行为的影响。结果表明，晶须分布均匀，与基体界面结合良好。硬度和极限拉伸强度（UTS）随着晶须含量的增加而增加，而延展性同时下降。在190°C时效30分钟后，复合材料的性能达到峰值硬度195 HV和UTS 400 MPa。与6061铝合金相比，由于制造过程中形成的高密度位错，晶须的存在可以加速复合材料的老化动力学。
6061 aluminum-alloy matrix composites are drawing greater attention due to their low density, excellent mechanical properties and wear resistance. In this study, in-situ generated MgAl2O4spinel whiskers reinforced 6061Al alloy matrix composites were fabricated and solutionizing and age hardening treatment was performed on the composites in a temperature range of 160–210 °C. The microstructure and mechanical properties of the composite were investigated and the influences of in-situ generated whiskers on aging behaviors of the composite were also discussed. The results show that the whiskers exhibit a homogeneous distribution with good interface bonding with the matrix. The hardness and ultimate tensile strength (UTS) increase with increasing content of the whisker, whereas the ductility decreases at the same time. The properties of the composites attained a peak value of 195 HV in hardness and 400 MPa in UTS after aging for 30 min at 190 °C. Compared with the 6061Al alloy, the presence of whiskers could accelerate the aging kinetics of composites due to the high density dislocations formed during the fabrication process.