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孙明艳,孟玉堂,张永皞,范啟超,王英英,李敬民,黄姝珂.凝固速度对Ni47Ti44Nb9铸态合金组织和织构的影响[J].稀有金属材料与工程(英文),2018,47(10):3185~3190.[Sun Mingyan,Meng Yutang,Zhang Yonghao,Fan Qichao,Wang Yingying,Li Jingmin and Huang Shuke.Influence of solidification rate on microstructure and texture of Ni47Ti44Nb9 cast alloy[J].Rare Metal Materials and Engineering,2018,47(10):3185~3190.]
Influence of solidification rate on microstructure and texture of Ni47Ti44Nb9 cast alloy
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Received:January 03, 2017  Revised:May 08, 2017
DOI:
Key words: shape memory alloy  Ni47Ti44Nb9  solidification rate  texture  ingot
Foundation item:中国工程物理研究院科学技术发展基金资助课题(2015B0302060)
Author NameAffiliation
Sun Mingyan,Meng Yutang,Zhang Yonghao,Fan Qichao,Wang Yingying,Li Jingmin and Huang Shuke  
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Abstract:
      The microstructure and texture of the Ni47Ti44Nb9 ingots under the condition of fast and slowly cooling rate were studied through optical microscope (OM), scanning electronic microscope (SEM) and X-ray diffraction (XRD). And then the effect mechanism of solidification rate on microstructure and texture was discussed. The results indicated that the preferred growth direction of Ni47Ti44Nb9 cast alloy is <113> and there is an important impact of solidification rate on the microstructure and texture of Ni47Ti44Nb9 cast alloy. In detail, when the cooling rate is fast, uniform dendrites with texture of {113} can be achieved, while in the case of slowly cooling, columnar dendrites with specific direction can be obtained and the main textures of vertical section are close to {113}<361>, {113}<332> and {113}<141>. In addition, the directional growth of dendrites induced by directional heat conduction during the process of solidification is found the main reason for the formation of cast microstructure and texture.