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Comparison of shape memory characteristics of a Ti-50.9 At. Pct Ni alloy aged at 473 and 673 K

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Abstract

The effect of aging on transformation and deformation behavior, i.e., the transformation temperatures, shape memory behavior, and multistage martensitic and R-phase transformations, was investigated for a Ti-50.9 at. pct Ni alloy aged at a low temperature (<600 K) rarely used for practical applications and at a high temperature (>600 K) conventionally used for practical applications. It was found that there are many differences between aging at 473 and 673 K. The martensitic and R-phase transformation temperatures significantly varied depending on aging time and temperature. It is found that two-stage R-phase and multistage martensitic transformations appear in both the specimens aged at 473 and 673 K, respectively. The two-stage R-phase transformation appeared by aging at 473 K over 36 ks, while the multistage martensitic transformation (MSMT) appeared by aging at 673 K in the range of aging times between 1.2 and 36 ks. It is found that the critical stress for slip increases with increasing aging time in specimens aged at 473 K, while that of specimens aged at 673 K increases with increasing aging time until reaching a maximum, then it decreases with a further increase in aging time. It is also found that the critical stress for slip is superior for specimens aged at 473 K than that for specimens aged at 673 K. It was confirmed that dense and fine lenticular precipitates of about 10 nm in length were formed through aging, resulting in superior shape memory characteristics.

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Authors and Affiliations

  1. the Department of Mechanical Engineering, Texas A&M University, 77843-3123, College Station, TX

    Jae Il Kim (Postdoctoral Researcher)

  2. the Institute of Materials Science, Tsukuba University, 305-8503, Ibaraki, Japan

    Shuichi Miyazaki (Professor)

Authors
  1. Jae Il Kim
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  2. Shuichi Miyazaki
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Kim, J.I., Miyazaki, S. Comparison of shape memory characteristics of a Ti-50.9 At. Pct Ni alloy aged at 473 and 673 K. Metall Mater Trans A 36, 3301–3310 (2005). https://doi.org/10.1007/s11661-005-0004-8

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  • DOI: https://doi.org/10.1007/s11661-005-0004-8

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