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材料工程  2012 

AlCoCrNiSix高熵合金微观组织结构与力学性能

, PP. 5-8

Keywords: 高熵合金,微观组织,相结构,力学性能

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Abstract:

通过XRD,SEM,EDS分析和显微硬度测试,系统研究了Si含量对AlCoCrNiSix高熵合金铸态组织的相结构变化、微观组织形貌特征和力学性能。结果表明随Si含量的增加,合金相结构由单一的bcc1固溶体结构逐步转化为bcc1+bcc2结构共存,其中bcc1为AlNi基的固溶体,bcc2为CrSi固溶体。随Si含量的增加,合金的铸态组织由枝晶形态向胞状形态转变。微观组织中Al,Ni主要存在于枝晶内,Si则偏析于枝晶间。Si具有显著提高合金硬度的作用,硬度最大值达到HV991。

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