Abstract
The precipitation behavior and distribution of Ni4Ti3 particles in NiTi alloys have a significant influence on the subsequent martensitic transformation, which may consequently affect shape memory effect and superelasticity of NiTi alloys. The latest experimental studies confirmed that in single crystal NiTi alloy, the Ni4Ti3 particles nucleate and grow as an autocatalytic way leading to a step–like configuration. The autocatalytic nucleation known as collective manner has been widely studied in martensitic transformation while causing relatively less attention in diffusion transformation such as precipitation. Previous studies have been launched to investigate the nucleation and orientation issues of Ni4Ti3 precipitate mainly by analyzing the stress or concentration field around the Ni4Ti3 particle. However, the coupling between stress and concentration field is necessary in * 50871039, 10151064101000017, 20110490881 ! 2012ZZ0014 : 2012–05–10, ! : 2012–07–22 $%! : , , 1981 , # &, DOI: 10.3724/SP.J.1037.2012.00264
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