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-phase transformation and the martensitic transformation that follows. The restriction of the Ti3Ni4 precipitates on the growth of the R-phase is indicated in Fig.3, which confirms the suggestion...-step martensitic transformation in aged NiTi shape memory alloy[J]. Scripta Materialia, 2004, 50: 819-823. [12]Kim J I, Liu Yinong, Miyazaki S. Ageing-induced two-stage R-phase transformation......
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Martensitic stabilization and defects induced by deformation in TiNi shape memory alloysKoichi Tsuchiya1,Minoru Umemoto21. Structural Functions Research Group,Innovative Materials Engineering Laboratory,National Institute for Materials Science2. Department of Production Systems Engineering,Toyohashi University of Technology摘 要:Martensitic stabilization......
that martensitic transformation occurs in weld zone and heat affected zone I and II which are characterized by acicular martensite α′ phase and retained β phase. The transformation of α to β phase is the only phase change process in heat affected zone Ⅲ. The extent of martensitic transformation is relevant to cooling rate in various region of the joint. The microhardness in weld zone is the highest......
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is defined as the process of reheating (recooling) after a stop during the martensitic transformation (reverse martensitic transformation)[8]. Fig.1 shows the schematic illustration of incomplete transformation cycling. The schematic illustration of incomplete transformation cycling during the reverse martensitic transformation is shown in Fig.1(b): (Step 1) heating from full martensite phase (T<Mf......
马氏体形态的平行多层截面法研究柳永宁1,张贵一1,李伟1(1.陕西省西安市西安交通大学金属材料强度国家重点实验室)摘 要:设计了一种平行截面原位观察方法,并研究了一种C含量(质量分数)为1.37%的高碳钢的马氏体形态.采用激光打孔定位,超细抛光多层减薄方法原位追踪测量了目标马氏体的长度,宽度与减薄厚度的变化.以厚度累加变化为横坐标,测量的长度与宽度对称分布为纵坐标,还原出的马氏体空间形态为扁椭球体,而不是传统教科书中描述的透镜体,椭球的几何参数为a/b≈3,a/c≈20.热力学分析表明:形核能量除了与材料的物理......
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高锰TRIP/TWIP钢压缩过程晶体学行为的EBSD分析 Ⅱ.马氏体内取向差,取向变化及奥氏体取向的影响杨平1,鲁法云1,孟利1,崔凤娥1(1.北京市北京科技大学材料学院)摘 要:本文利用EBSD技术研究了高锰钢压缩变形过程中两类马氏体(六方结构ε-M和bcc结构α′-M)内的形变特征以及奥氏体取向对马氏体取向变化的影响.结果表明,马氏体形变过程中,ε-M内除继承相变取向关系外,主要是滑移造成的小角度取向差和特殊取向差93°<7253>.α′-M内除变体间产生的特殊取向差及奥氏体孪晶遗传下来的特殊取向差外,只有......