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Building Hierarchical Martensite
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DOI：10.1002/adfm.202005715.png)
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摘要
En 中文
Martensitic materials show a complex, hierarchical microstructure containing structural domains separated by various types of twin boundaries. Several concepts exist to describe this microstructure on each length scale, however, there is no comprehensive approach bridging the whole range from the nano- up to the macroscopic scale. Here, it is described for a Ni-Mn-based Heusler alloy how this hierarchical microstructure is built from scratch with just one key parameter: the tetragonal distortion of the basic building block at the atomic level. Based on this initial block, five successive levels of nested building blocks are introduced. At each level, a larger building block is formed by twinning the preceding one to minimize the relevant energy contributions locally. This naturally explains the coexistence of different types of twin boundaries. The scale-bridging approach of nested building blocks is compared with experiments in real and reciprocal space. The approach of nested building blocks is versatile as it can be applied to the broad class of functional materials exhibiting diffusionless transformations.
Keyword:
martensitic microstructures
shape memory alloys
twin boundaries
twins‐ within‐ twins
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期刊
IF:
19
论文数:
3.5W
被引数:
32.1W
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Evidence for a monoclinic incommensurate superstructure in modulated martensite.png)
ACTA MATERIALIA
ACTA MATERIALIAIF9.3
PREAI
分享收藏分享收藏Microstructural and crystallographic characteristics of modulated martensite, non-modulated martensite, and pre-martensitic tweed austenite in Ni-Mn-Ga alloysACTA MATERIALIAOAAI
ACTA MATERIALIAIF9.3
OAAI分享收藏
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