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,2018,47(10):3185~3190.[Sun Mingyan,Meng Yutang,Zhang Yonghao,Fan Qichao,Wang Yingying,Li Jingmin,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.]
凝固速度对Ni47Ti44Nb9铸态合金组织和织构的影响
投稿时间:2017-01-03  修订日期:2017-05-08
中文关键词:  形状记忆合金  Ni47Ti44Nb9  凝固速度  织构  铸锭
基金项目:中国工程物理研究院科学技术发展基金资助课题(2015B0302060)
中文摘要:
      对比研究了Ni47Ti44Nb9合金快冷铸锭和慢冷铸锭的宏、微观组织和织构特点,分析了凝固速度对组织和织构的影响机理。采用光学显微镜(OM)和扫描电子显微镜(SEM)观察了微观组织,采用X射线衍射(XRD)分析了织构。结果表明,铸态Ni47Ti44Nb9合金具有<113>方向的择优生长取向;凝固速度对Ni47Ti44Nb9合金铸态组织和织构的形成具有重要影响,快速冷却条件下获得均匀的树枝晶组织,铸锭的横、纵截面均形成{113}织构,慢速冷却条件下形成具有特定方向的柱状树枝晶,纵截面织构以{113}<361>、{113}<332>和{113}<141>为主;凝固过程中热量方向性传导造成的树枝晶定向生长是影响合金铸态组织和织构形成的主要原因。
Influence of solidification rate on microstructure and texture of Ni47Ti44Nb9 cast alloy
英文关键词:shape memory alloy  Ni47Ti44Nb9  solidification rate  texture  ingot
英文摘要:
      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.
作者单位E-mail
孙明艳 中国工程物理研究院机械制造工艺研究所 yanmingsun18@163.com 
孟玉堂 中国工程物理研究院机械制造工艺研究所  
张永皞 中国工程物理研究院机械制造工艺研究所  
范啟超 中国工程物理研究院机械制造工艺研究所  
王英英 中国工程物理研究院机械制造工艺研究所  
李敬民 中国工程物理研究院机械制造工艺研究所  
黄姝珂 中国工程物理研究院机械制造工艺研究所 huangshuke@caep.cn 
摘要点击次数: 15
全文下载次数: 8
查看全文  查看/发表评论  下载PDF阅读器
关闭