材料期刊网

IN SITU TEM STUDY ON THE R-PHASE TRANSFORMATION IN TiNi ALLOY

CHEN Qing , WU Xingfang and C. J. Humphreys(Department of Materials Physics , University of Science and Technology Beijing , Beijing 100083 , China)(Department of Materials Science and Metallurgy , University of Cambridge , Cambridge CBZ 3QZ , U. K.)Manuscript received 30 November 1995 , in revised form 17 April 1995

金属学报(英文版)

The R-phase transformation process in selected TiNi alloys has been studied in great detail by using in situ TEM technique. The R-phase transformation was found to be a reversible thermoelastic displacive transformation with a nucleation and growth process. The R-phase nucleates at the precipitate/matrix interface in aged specimens and grows by moving the coherent R/matrix interfaces. The stress field of Ti3Ni4 precipitates plays a much more important role in the formation of the R-phase than dislocations in aged TiNi alloy. The microstructure of the R-phase has also been studied.

关键词: : R-phase transformation; TiNi alloy; in situ TEM