Tensile behavior of Ti-22Al-24Nb-0.5Mo in the range 25–650 °C
Tensile behavior of Ti-22Al-24Nb-0.5Mo in the range 25–650 °C
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DOI：
10.1016/j.msea.2016.10.047
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发表时间：
2017-01
期刊：
影响因子：
6.4
通讯作者：
Hongze Zhao;B. Lu;M. Tong;Rui Yang
中科院分区：
文献类型：
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作者：
Hongze Zhao;B. Lu;M. Tong;Rui Yang
研究了Ti-22Al-24Nb-0.5Mo （at%）合金在25 ~ 650℃温度范围内的拉伸和断裂行为。O+bcc微观结构（篮织板条型）在500°C时伸长率最大，在650°C时伸长率下降，这是先前研究人员提出的动态应变老化的结果。α2+bcc组织具有最高的室温伸长率（εf>18%）， 650℃时伸长率下降的原因是bcc相析出了细小的O相。α2+O+bcc组织达到了强度与塑性的最佳平衡。
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 (εf>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.