Tensile behavior of Ti-22Al-24Nb-0.5Mo in the range 25-650 °C

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• 作者：Hongze Zhao^a ; ^b ; Bin Lu^a ; ^{blu@imr.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Min Tong^a ; Rui Yang^a
• 关键词：Ti2AlNb-based alloy ; Microstructures ; Tensile behavior ; Fracture mechanisms
• 刊名：Materials Science & Engineering A
• 出版年：2017
• 出版时间：2 January 2017
• 年：2017
• 卷：679
• 期：Complete
• 页码：455-464
• 全文大小：7145 K

文摘

The tensile and fracture behavior of an orthorhombic alloy Ti-22Al-24Nb-0.5Mo (at%) with three types of microstructure were investigated in the temperature range between 25 °C and 650 °C. The O+bcc microstructure (basketweave lath type) possesses an elongation maximum at 500 °C and its drop at 650 °C has been attributed to dynamic strain aging as suggested by previous investigators. The α₂+bcc microstructure has the highest room temperature elongation (ε_f >18%) and the cause of the elongation drop at 650 °C is suggested to be the fine O phase precipitates from the bcc phase. An optimal balance between strength and plasticity was achieved in the α₂+O+bcc microstructure.