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Martensitic transformations in 'unfamiliar' systems

机译：“陌生”系统中的马氏体转变

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In stiff engineering materials, martensitic transformations are shear-dominant diffusionless processes, and their crystallographic features can be successfully predicted using the phenomenological theory of martensite crystallography (PTMC). Recently, an alternative approach has been developed wherein the interface structure is modelled in terms of interfacial dislocations. This model, referred to as the topological model (TM), provides insight into the transformation process and identifies a set of five criteria that must be met for a transformation to be diffusionless. In the case of stiff engineering materials, the crystallographic predictions of the PTMC and TM are very similar. However, the TM enables a broader range of transformations to be treated, and two examples of 'unusual' martensites are presented here. The first is a diffusionless transformation in a small elastically soft protein crystal. The second is a transformation in a prospective high-temperature engineering alloy which exhibits the characteristic crystallographic features of martensite but where concomitant diffusion occurs. In this case, four of the five criteria mentioned above that relate to conservation of substitutional atomic sites are satisfied.
机译：在硬质工程材料中，马氏体转变是剪切为主的无扩散过程，可以使用马氏体晶体学的现象学理论（PTMC）成功预测其晶体学特征。最近，已经开发出一种替代方法，其中根据界面位错对界面结构进行建模。此模型称为拓扑模型（TM），可提供对转换过程的洞察力，并确定要使转换无扩散必须满足的五个条件。对于硬质工程材料，PTMC和TM的晶体学预测非常相似。但是，TM可以处理更广泛的相变，此处提供了两个“不寻常”马氏体的示例。第一个是小的弹性​​软蛋白晶体中的无扩散转变。第二个是预期的高温工程合金的转变，该合金表现出马氏体的特征结晶学特征，但会发生伴随扩散。在这种情况下，上述与取代原子位点的守恒有关的五个标准中的四个被满足。

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