期刊
SCRIPTA MATERIALIA
卷 217, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114770
关键词
Twinning; High entropy alloy; Martensitic phase transformation; HRTEM
类别
资金
- National Key Research and Development Program of China [2021YFB3702400]
- Shenzhen Science and Technology Innovation Commission [KQTD20170328154443162, ZDSYS201703031748354]
- GuangDong Basic and Applied Basic Research Foundation [2021A1515110348]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/P006566/1]
- EPSRC [EP/R00661X/1]
- Henry Royce Institute for Advanced Materials
The study uncovers a special twinning transformation mechanism in the formation of {332}(BCC) twinning in high entropy alloys, providing insights into the process of twinning generation in this specific alloy system.
In this work, the origin of {332}(BCC )twinning was investigated in a body-centered-cubic (BCC) high entropy alloy (TiZrHf)87Ta13 (at.%). Detailed transmission electron microscopy analysis of the deformed microstructure revealed that a special {351} < 211 >(alpha) type II twinning generates in the early deformation stage, and with further straining, the {351} < 211 >(alpha) type II twin variant accommodates into a {351}(alpha) type I twin variant. The resultant {351}(alpha) type I twinning exhibits good lattice correspondence with the {332}BCC twinning and further propagates into the retained BCC grain with orientation relationship of {351}(alpha) //(332)(BCC), structuring into a {332}(BCC) twin-like configuration. Based on the experimental results and twinning analysis through evaluating twinning shear and atomic shuffle mechanism of this specific feature, our findings provide an alternative mechanism for the formation of {332}(BCC) twinning in which a special martensitic type II to type I twinning transformation mechanism took effect.
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