Influence of Heating Temperature on Microstructure Characteristics of Directionally Solidified Ni-45Ti-5Al Alloy

摘要：

　　The microstructure evolution of Ni-45Ti-5Al(atomic fraction,%) alloys prepared by directional solidification with liquid-metal-cooling at different temperatures of 1450℃,1550℃ and 1650℃ was investigated.The results showed that the macrostructure in directional solidification growth region was obvious columnar grains.The microstructure was cellular growth structure,and composed of primary NiTi matrix and Ti2Ni precipitates.The preferred orientation of NiTi and Ti2Ni were respectively 100 and 111 direction.It was found that aluminum was dissolved in both NiTi and Ti2Ni phase.The Al content in the matrix was higher than it in the precipitates.As heating temperature increasing,the microstructure evolution was inconspicuous and the average cellular spacing was 30~50μm.The Ti2Ni volume percent was most when the heating temperature was 1550℃.

关键词： Ni-45Ti-5Al alloy directional solidification microstructure heating temperature

作者: Xiaoli ZHANG Ruolei LI Chunyan YANG Xiaofan CHEN Hu ZHANG

作者单位: Military Transportation University, Tianjin 300161, China School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Bei

会议类型: 国际会议

会议名称: 2012 International Conference on Chemical Engineering,Metallurgical Engineering and Metallic Materials(2012化工、冶金和金属材料国际会议(CMMM2012))

会议地点: 昆明

会议语种:英文

页码: 414-417

在线出版日期: 2012-10-12（万方平台首次上网日期，不代表论文的发表时间）