Precipitation hardening by nanoscale Ti2Ni phase in high Ti-rich Ti52.6Ni46.8Si0.6 melt-spun ribbon
作者： Chih-Hsuan Chen , Yen-Cheng Wang , Shyi-Kaan Wu , Nian-Hu Lu
DOI: 10.1016/J.JALLCOM.2019.151904
关键词:
摘要: Abstract A high Ti-rich Ti52.6Ni46.8Si0.6 ribbon was investigated to reveal the precipitation hardening effect caused by nano-scale Ti2Ni precipitates. TEM observations revealed only second phase in after aging treatment, which induced R transformation detected DSC tests. Nanoindentation measurements demonstrated increment of hardness from 2.43 GPa 2.98 GPa, an about 22%, first 3 h treatment at 500 °C. The pseudoelasticity (PE) ribbon, evaluated depth and energy recovery ratios nanoindentation tests, also that 3 h-aged had best performance. shape memory (SME) exhibited performance with a recoverable strain 3.5% irrecoverable smaller than 0.1%. Both PE SME tests precipitates can effectively improve properties TiNi ribbons.
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