AlCoCrNiSiTix高熵合金微观组织结构与力学性能的影响
Microstructure and Mechanical Performance of AlCoCrNiSiTix High-entropy Alloys
刘恕骞
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作者单位：四川大学
中文关键字：高熵合金；微观组织；树枝晶；硬度
英文关键字：high-entropy alloy, microstructure, dendritic crystal, hardness
中文摘要：摘要：通过XRD、SEM、EDS分析及显微硬度测试，研究了不同Ti含量的AlCoCrNiSiTix高熵合金微观组织结构与力学性能。结果表明：AlCoCrNiSiTix高熵合金主要以bcc1+bcc2两相共存，其中bcc1为AlNi固溶体，bcc2为CrSi固溶体，随着Ti元素的添加合金中出现了少量的Ni3Ti金属间化合物。Ti的添加，合金铸态组织形态呈树枝晶状，微观组织中Al、Ni、Ti主要存在于枝晶内，Cr、Si主要偏析于枝晶间。随着Ti含量的增加，合金硬度值显著提高。
英文摘要：Abstract: The effects of Ti contents on the microstructure and mechanical properties of AlCoCrNiSiTix high-entropy alloys were investigated respectively by using of XRD, SEM, EDS and micro-hardness testing. The results reveal that there are bcc1 and bcc2 phase mainly in AlCoCrNiSiTix high-entropy alloys. The bcc1 is AlNi solid solution structure and the bcc2 is CrSi solid solution structure. A small amount of the Ni3Ti intermetallic compound was found in the alloys and the as-cast microstructure of alloys appears the dendritic crystal morphology as Ti elements are added. Al, Ni, Ti mainly exist with in the dendritic crystal and Cr, Si elements segregates in the interdendritic region within the as-cast microstructure. The hardness of the AlCoCrNiSiTix alloys improved dramatically with the Ti content increasing.