Transformation behaviour of a Ti50Ni47Fe3 alloy II. Subsequent premartensitic behaviour and the commensurate phase
Transformation behaviour of a Ti50Ni47Fe3 alloy II. Subsequent premartensitic behaviour and the commensurate phase
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DOI：
10.1080/01418618308243107
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发表时间：
1983
影响因子：
1.6
通讯作者：
C. Hwang;M. Meichle;M. Salamon;C. M. Wayman
中科院分区：
文献类型：
--
作者：
C. Hwang;M. Meichle;M. Salamon;C. M. Wayman
摘要发现 Ti50Ni47Fe3 合金中的第二个“前马氏体”效应发生在比前一篇论文中描述的初始“正常到不相称”转变开始温度低约 12°C 的温度。随后的相变涉及从“扭曲的”CsCl 母体到菱形六面体产物的结构转变，在此期间“1/3”超晶格反射被转移到精确的 1/3 位置。菱面体畸变是通过沿 <111> 方向均匀膨胀来实现的，使晶格和 CDW 锁定并变得相称。与这种结构转变相关的微观结构变化涉及“针”状域的四种晶体变体的形成（三种变体和“基质”）。每个这样的域都有其独特的菱面体轴，反映了沿着立方晶胞的四个 <111> 体对角线之一的菱面体畸变。 “针”域和基体相对于 {110} 孪晶面是孪晶相关的。小反相状...
Abstract A second ‘premartenaitic’ effect in a Ti50Ni47Fe3 alloy was found to occur approximately 12°C below the onset of the initial ‘normal-to-incommensurate’ transition described in the previous paper. This subsequent phase change involves a structural transition from a ‘distorted’ CsCl parent to a rhombohedral product, during which the ‘1/3’ superlattice reflections are shifted to precise 1/3 positions. The rhombohedral distortion is effected by a homogeneous expansion along 〈111〉 directions, allowing the lattice and CDWs to lock in and become commensurate. Microstructural changes associated with this structural transition involve the formation of four crystallographic variants of ‘needle’-like domains (three variants and the ‘matrix’). Each such domain has its unique rhombohedral axis, reflecting the rhombohedral distortion along one of the four 〈111〉 body diagonals of the cubic unit cell. The ‘needle’ domains and the matrix are twin-related with respect to a {110} twinning plane. Small antiphase-lik...