Formation mechanism of partial stacking faults by incomplete mixed-mode phase transformation: A case study of Fe-Ga alloys
Formation mechanism of partial stacking faults by incomplete mixed-mode phase transformation: A case study of Fe-Ga alloys
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不完全混合模式相变部分堆垛层错的形成机制：以Fe-Ga合金为例
DOI：
10.1016/j.jmst.2021.12.009
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发表时间：
2022-02
影响因子：
10.9
通讯作者：
Xiaobing Ren
中科院分区：
文献类型：
--
作者：
Tianzi Yang;Tianyu Ma;Feng Liu;Xiaobing Ren
不完全混合型相变形成的部分层错(PSF)不同于固定距离的形变诱导层错(SFS)，表现出紧密堆积面的不固定滑移距离。虽然工程化的PSFs可以产生吸引人的性能，如增强的阻尼能力，但对晶格扭曲和原子扩散之间的相互作用以及它们对形成PSFs的影响的了解还远远不清楚。本文对时效Fe-Ga合金进行了从体心立方(BCC)到有序面心立方(FCC)的混合型相变的研究。透射电子显微镜研究表明，PSFs的断层{111}-fcc距离比变形面心立方材料中典型的{111}-lt；112>；SFS的a/6<；112>；短，且PSFs具有无序的Fe和Ga排列。进一步的研究表明，即使在长期等温时效后，这种PSFs也不会在面心立方孪晶界(TBS)完全解离。因此，PSFs的形成可以归因于母体体心立方晶格的相变相关的原子有序和晶格剪切应变，其中与PSFs相关的位错的扩散控制的滑移将由于位错管效应而加速原子沿-112&>-fcc方向的扩散，但由于滞后效应可能阻碍原子在{111}-fcc TBS上的扩散。这一研究有助于加深对混合模相变过程中缺陷过程的认识，拓宽对同时发生的晶格畸变与原子扩散相互作用的认识。
Partial stacking faults (PSFs) formed by incomplete mixed-mode phase transformation have been found to exhibit unfixed slip distance of closely-packed planes unlike those of the deformation-induced stacking faults (SFs) with fixed distance. Though engineering PSFs can yield appealing properties, such as the enhanced damping capacity, understanding of the interaction between lattice distortion and atomic diffusion and their influences on forming PSFs is still far from being clear. Herein we performed a case study on aged Fe-Ga alloy that undergoes a mixed-mode phase transformation from body-centered cubic (BCC) to ordered face-centered cubic (FCC). The TEM investigations showed that the faulted {111}-FCC distance of the PSFs is shorter thana/6<112> of the typical {111}-<112> SFs in deformed FCC materials and the PSFs have disordered Fe and Ga arrangements. Further studies revealed that such PSFs will not be completely dissociated at FCC twin boundaries (TBs) even after long term isothermal aging. Consequently, the formation of PSFs can be ascribed to the transformation-dependent atomic ordering and lattice shear strain of the parent BCC lattice, where the diffusion-controlled glides of the PSFs-associated dislocations will accelerate atomic diffusions due to the dislocation-pipe effect along <112>-FCC direction, but may hinder the atomic diffusions across the {111}-FCC TBs due to the retarding effect. This study may add important insight into the defects process during mixed-mode phase transformation and broaden the knowledge of the interaction between concurrently-happened lattice distortion and atomic diffusion.
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