A study on the formation mechanisms of butterfly-type martensite in Fe–30% Ni alloy using EBSD-based orientation microscopy
A study on the formation mechanisms of butterfly-type martensite in Fe–30% Ni alloy using EBSD-based orientation microscopy
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DOI：
10.1016/j.actamat.2008.12.035
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发表时间：
2009-04
期刊：
影响因子：
9.4
通讯作者：
H. Sato;S. Zaefferer
中科院分区：
文献类型：
--
作者：
H. Sato;S. Zaefferer
研究了Fe-30%Ni合金中蝶形马氏体（α′）与奥氏体基体（γ）之间的空间取向分布和晶体取向关系。α′板块的一个α′-γ界面主要表现为G-T（Greninger-Troiano）OR，而另一面则同时表现为Kudjumov-Sachs和G-T OR。这是由于α′长大过程中相变应变的调节过程发生了变化。此外，α′板块内部的取向从一个α′-γ界面到另一个连续变化。在γ基体中观察到类似的取向变化，但仅在板的一侧。这些取向梯度有一个共同的旋转轴，可以用α′板块生长过程中的位错遗传来解释。根据α′-γ界面上OR的局部变化以及α′和γ内部的取向梯度，讨论了α′的形成过程。
The spatial orientation distribution and crystal orientation relationships (ORs) between a butterfly-type martensite (α′) plate and its austenite matrix (γ) in Fe–30% Ni alloy were investigated in detail. One α′–γ interface of the α′ plate mainly exhibits a G–T (Greninger–Troiano) OR, while the other side shows both Kudjumov–Sachs and G–T ORs. It is proposed that the difference between the two sides arises due to a change of the accommodation process for transformation strain during the growth of α′. Moreover, orientations inside the α′ plate continuously change from the one α′–γ interface to the other. A similar orientation change is observed in the γ matrix but only on one side of the plate. These orientation gradients have a common rotation axis and are explained in terms of dislocation inheritance during the growth of the α′ plate. Based on the local changes of ORs at α′–γ interface and the orientation gradients inside α′ and γ, the α′ formation process is discussed.