Microstructure modifications by tensile deformation in Ti-Ni-Fe alloy
Microstructure modifications by tensile deformation in Ti-Ni-Fe alloy
复制标题
Ti-Ni-Fe 合金拉伸变形改变显微组织
DOI：
10.1051/jp4:20031003
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
M. Asai
中科院分区：
文献类型：
--
作者：
M. Nishida;K. Tanaka;S. Li;M. Kohshima;S. Miura;M. Asai
利用Ti 50 Ni 48 Fe 2，在200 ~ 800 K的宽温度范围内进行拉伸试验和TEM观察，研究了Ti-Ni合金体系中异常延展性的成因。所用合金的优点是在高温拉伸试验中不分解。拉应力-应变曲线分为三种类型。400k以下的拉伸变形行为与应力和/或应变诱导的马氏体相变有关。应力-应变曲线在400 ~ 700 K之间出现锯齿状，这是由多种变形孪晶的形成和较大的孪晶剪切引起的。这些孪晶的形成和滑移体系的增加导致了异常的延性。在拉伸试验中，在700k以上发生颈缩，在变形的试样中只看到位错。然而，在整个研究过程中，汉堡矢量的类型不随变形温度的变化而变化。
The origin of anomalous ductility in Ti-Ni alloy systems has been investigated by using Ti 50 Ni 48 Fe 2 with tensile tests at wide temperature range about 200 to 800 K and TEM observations. The advantage of the alloy used is that there is no decomposition during tensile test at elevated temperature. Tensile stress-strain curve is divided into three types. Below 400 K tensile deformation behavior relates to stress and or strain induced martensitic transformation. Between 400 and 700 K serration is observed in stress-strain curve, which is derived from the formation of various deformation twins with rather large twinning shear. Anomalous ductility is attribute to the formation of these twins and increment of slip system. Above 700 K necking take place during tensile test and only dislocations are seen in the deformed specimen. However, type of burgers vector dose not change with deformation temperature throughout the present study.