纳米尺寸NiTi多晶微带中马氏体相变的原位透射电镜研究
王晓冬1, 2，李海鑫1，臧科涛1，毛圣成1*，张 泽1, 3，韩晓东1
(1.北京工业大学固体微结构与性能研究所，北京100124；2. 中国人民武装警察部队学院基础部，河北廊坊 065000；3. 浙江大学材料科学与工程学系，浙江大学电子显微镜中心，浙江杭州310027）
摘要：纳米尺寸NiTi合金中的马氏体相变行为决定了其在微纳尺度的应用。利用透射电镜对拉伸变形NiTi微带中的马氏体相变行为进行了原位研究。研究发现当应变达到0.9%时，马氏体首先在取向择优的晶粒内形核、长大和扩展。继续拉伸样品至断裂（应变为5.2%），相邻取向不择优的晶粒内没有观察到马氏体形核。由于NiTi微带包含不容易发生马氏体相变的晶粒，且发生相变的晶粒内应力集中，导致其断裂应变远小于块体样品的断裂应变。实验结果说明当将NiTi合金应用于微纳尺度时需充分考虑纳米尺寸材料中的马氏体相变行为及其力学性能的影响。
关键词：NiTi合金；原位TEM；纳米尺寸；应力诱发马氏体相变
中图分类号：TB381；TB303；TG115.21+5.3 文献标识码：A doi:10.3969/j.1000-6281.2014.04.003
In situ TEM studies of the stress-induced martensitic transformation in nanometric NiTi polycrystal strips
WANG Xiao-dong1, 2, LI Hai-xin1, ZANG Ke-tao1, MAO Sheng-cheng1*,
ZHANG Ze1, 3, HAN Xiao-dong1
(1.Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124; 2. Basic Course Teaching Department，the Armed Police Academy, Langfang Hebei 065000; 3. Department of Materials Science, Zhejiang University, Hangzhou Zhejiang 310027, China)
Abstract：Martensitic transformation in nanosized NiTi alloys determines its application in micro- and nanoscale. The martensitic transformation behaviors in nanometric NiTi alloys were in situ studied in TEM. The results showed that martensitic plates first nucleate, grow and propagate in grains with preferred orientation, when the strain reachs 0.9%. However, no martensitic plate nucleated in grain with none-preferred orientation. Because of the none-transforming grain as a component of the strip, and the stress localization in the transforming grains, the fracture strain of NiTi strip is much smaller than the bulk materials. The results indicates that when the NiTi alloys is applicated in micro- and nano-scale, the martensitic transformation behaviors in nanosized NiTi and its influence on the mechanical properties should be thoroughly considered.
Keywords:NiTi alloys; in situ TEM; nano size; stress-induced martensitic transformation
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