Characteristics of the strain glass transition in as-quenched and 250 °C early-aged Ti 48.7 Ni 51.3 shape memory alloy

Chen Chien, Cheng Si Tsao, Shyi Kaan Wu, Chih Yu Chang, Pei Chi Chang, Yung Kang Kuo

研究成果: 雜誌貢獻文章同行評審

8 引文 斯高帕斯(Scopus)

摘要

Characteristics of the strain glass transition exhibited in as-quenched and 250 °C 1–5 h aged Ti 48.7 Ni 51.3 SMA were studied by various tests/measurements. The results of frequency-dependent storage modulus vs. temperature measurement, the temperature-dependent resistivity, thermal conductivity, and specific heat tests demonstrated the signature and characteristics of the strain glass transition exhibited in as-quenched and 250 °C early-aged Ti 48.7 Ni 51.3 SMA. The plate-/disk-like morphology and spatially heterogeneous distribution of the real Ni-rich nanodomains in as-quenched and 250 °C 1–5 h aged specimens were quantitatively characterized using small-angle X-ray scattering (SAXS) technique. The formative origin of the real nanodomains and the relationship between the real nanodomains and the strain nanodomains are proposed accordingly. Experimental results indicated R-like phase and Ti 3 Ni 4 -like precipitates co-existing in the strain glass of 250 °C early-aged specimens, and they also demonstrated the growth behavior of the real nanodomains exhibited in specimens during thermal aging. It was also found that increasing the aging time can elevate the T g from ∼−60 °C to ∼−20 °C, which indicates the tunable characteristic of T g for as-quenched Ti 48.7 Ni 51.3 SMA.
原文英語
頁(從 - 到)159-167
頁數9
期刊Acta Materialia
120
DOIs
出版狀態已發佈 - 十一月 1 2016
對外發佈

ASJC Scopus subject areas

  • 電子、光磁材料
  • 陶瓷和複合材料
  • 聚合物和塑料
  • 金屬和合金

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