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Crystallography of the martensitic transformation between Ni_2In-type hexagonal and TiNiSi-type orthorhombic phases

Journal of Materials Science & Technology 2022年第9期104卷 59-66页

作者： Tingting Zhang Yuanyuan Gong Bin Wang Dongyu Cen Feng Xu MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Nanjing University of Science and TechnologyNanjing 210094China

mnmx(M=Co or Ni,X=Si or Ge)alloys,experiencing structural transformation between Ni_(2) In-type hexagonal and TiNiSi-type orthorhombic phases,attract considerable attention due to their potential applications as room-temperature solid *** lots of studies have been carried out on how to tune this transformation and obtain large entropy change in a wide temperature region,the crystallography of this martensitic transformation is still *** biggest obstacle for crystallography investigation is to obtain a bulk sample,in which hexagonal and orthorhombic phases coexist,because the mnmx alloys will fragment into powders after experiencing the *** this reason,we carefully tune the transformation temperature to be slightly below 300 *** that case,a bulk sample with small amounts of orthorhombic phases distributed in hexagonal matrix is *** importantly,there are no cracks between the two *** facilities us to investigate the microstructure using electron *** obtained results indicate that the orientation relationship between hexagonal and orthorhombic structures is[4223]_(h)//[120]_(o)&(0110)_(h)//(001)_(o) and the habit plane is{2113.26}_(h).WLR theory is also adopted to calculate the habit *** calculated result agrees well with the measured *** work reveals the crystallography of hexagonal-orthorhombic transformation for the first time and is helpful for understanding the transformation-associated physical effects in mnmx alloys.

关键词： Martensitic transformation mnmx alloys Orientation relationship Habit plane Crystallography of martensitic transformation

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