Influence of Ti addition on microstructure and mechanical behavior of a FCC-based Fe₃₀Ni₃₀Co₃₀Mn₁₀ alloy

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• 作者：Bingyong Wu ; Weiping Chen ; ^{mewpchen@scut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhenfei Jiang ; Zhen Chen ; Zhiqiang Fu ; ^{kopyhit@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：High entropy alloy ; Alloying behavior ; Microstructure ; Titanium ; Spark plasma sintering
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：31 October 2016
• 年：2016
• 卷：676
• 期：Complete
• 页码：492-500
• 全文大小：2707 K

文摘

The influence of Ti addition on microstructure and mechanical behavior of a face-centered cubic (FCC) structured Fe₃₀Ni₃₀Co₃₀Mn₁₀ alloy, was investigated systematically. Fe₃₀Ni₃₀Co₃₀Mn₁₀ and Fe₂₇Ni₂₇Co₂₆Mn₁₀Ti₁₀ alloys were successfully fabricated via mechanical alloying (MA) and spark plasma sintering (SPS) in the present work. During the MA process, the X-ray diffraction (XRD) patterns indicated that a single FCC structured solid-solution phase was formed in both of the two investigated alloys, suggesting an invisible influence of Ti addition on alloying behavior. Following SPS, the bulk Fe₃₀Ni₃₀Co₃₀Mn₁₀ alloy showed a single FCC phase with ultra-fine grains, whereas the Fe₂₇Ni₂₇Co₂₆Mn₁₀Ti₁₀ alloy exhibited two FCC (FCC1 and FCC2) phases showing ultra-fine grains and nanosized grains. Adding Ti into the Fe₃₀Ni₃₀Co₃₀Mn₁₀ alloy, the Fe₂₇Ni₂₇Co₂₆Mn₁₀Ti₁₀ alloy exhibited an enhanced ability of forming nanoscale twins. The yield strength, compressive strength, strain-to-failure and Vickers hardness of the bulk Fe₃₀Ni₃₀Co₃₀Mn₁₀ alloy are 1144±17 MPa, 1798±9 MPa, 33.8±0.5% and 339±18 Hv, respectively. With Ti addition, the Fe₂₇Ni₂₇Co₂₆Mn₁₀Ti₁₀ alloy shows higher strength and Vickers hardness, but lower strain-to-failure, which is resulted from the enhanced solid-solution strengthening caused by the addition of Ti and the enhanced grain boundary strengthening due to the presence of a large quantity of nanoscale grains.