Effect of vanadium addition on the microstructure and properties of AlCoCrFeNi high entropy alloy

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• 作者：Yong Dong ; Kaiyao Zhou ; Yiping Lu ; ^{luyiping@dlut.edu.cn" class="auth_mail} ; Xiaoxia Gao ; Tongmin Wang ; ^{tmwang@dlut.edu.cn" class="auth_mail} ; Tingju Li
• 刊名：Materials and Design
• 出版年：May, 2014
• 年：2014
• 卷：57
• 期：Complete
• 页码：67-72
• 全文大小：3092 K

文摘

The purpose of this study is to investigate the effects of vanadium addition on the microstructure and mechanical properties of AlCoCrFeNiV_x (x values in molar ratio, x = 0, 0.2, 0.5, 0.8, 1.0) alloys. All the alloys were found to display a crystalline structure of simple body centered cubic (BCC). For AlCoCrFeNi and AlCoCrFeNiV_0.2 alloys, Cr and Fe elements segregated to the center of grain while Al and Ni elements segregated to the rest areas. With the increase of V content exceeding to x = 0.5, the homogenized polycrystalline grain can be obtained. For AlCoCrFeNiV_0.2 alloy, the compressive strength and plastic strain were as high as 3297.8 MPa and 26.8%, respectively, which were rare in high entropy alloys to date. The fine nanoscale spinodal decomposition microstructure was a key factor for the high fracture strength of AlCoCrFeNiV_0.2 alloy. The values of Vickers hardness increased from HV534 to HV648.8 with the increase of V content. The solid-solution strengthening of the body centered cubic matrix was found as the main factor that strengthened the alloys. With the increase of V contents from x = 0 to x = 1.0, the transformation of ferromagnetic behavior to paramagnetic behavior takes place.