Observations on multiple deformation microstructures at the very early plastic deformation stages of Fe-Mn based alloys

研究了变形方式对高锰奥氏体钢屈服强度的影响。三种塑性变形机制的商品和区别，讨论了形变诱发γ→ε马氏体相变、γ形变孪晶和滑移形变的形核、发展及其对力学性能的影响。它们通常通过剪切型位移在紧密堆积的{111}面上形成，因此呈现板状形貌。它们被描述为有规律地重叠堆垛层错。另一方面，宏观性能，如多晶合金的屈服应力是由起始应力和各种微观结构的相互作用的板，这是不同的影响的存在/不存在的相变，堆垛层错能和板形核位置的分布。

We investigated the effect of deformation modes on the proof stress of high-Mn austenitic steels. Commodities and differences among three plastic deformation mechanisms, i.e., deformation-induced γ→ε martensitic transformation, γ deformation twinning and slip deformation, are discussed in their nucleation, development and the effect on mechanical properties. They are commonly formed on the closely-packed {111} planes by the shear-type displacement and thus exhibit plate-like morphologies. They are described by regularly overlapping stacking faults. On the other hand, macroscopic properties such as the proof stress of polycrystal alloys are determined by the onset stress and a variety of microstructural interactions of the plates, which are differently affected by the existence/absence of the phase transformation, the stacking fault energy and the distribution of the plate nucleation sites.