Grain refinement of a rapidly solidified Ti–30Ni–20Cu alloy by two-step annealing

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• 作者：Min-soo Kim ; Gyu-bong Cho ; Jung-pil Noh ; Young-min Jeon ; Yeon-wook Kim ; Shuichi Miyazaki ; Tae-hyun Nam
• 关键词：Shape memory alloys ; Grain refining ; Crystallization ; Melt spinning
• 刊名：Scripta Materialia
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：63
• 期：10
• 页码：1001-1004
• 全文大小：632 K

文摘

Ti–30Ni–20Cu (at. % ) alloy ribbons with an average grain size of 0.25–0.28 μm were obtained by applying two-step annealing, comprising a first annealing step at 773–823 K and a second annealing step at 748 K, to amorphous melt-spun ribbons, which was very small compared with ribbons obtained by one-step annealing at 748–823 K (0.64–1.20 μm). Hysteresis and elongation associated with the B2–B19 transformation were decreased by two-step annealing, while the fracture stress and strain increased.