Martensite and reverse transformation temperatures of TiAu-based and TiIr-based intermetallics

JOURNAL OF ALLOYS AND COMPOUNDS

卷:870

Article

Zarinejad, Mehrdad¹  Wada, Kiyohide²  Pahlevani, Farshid³  Katal, Reza⁴  Rimaz, Sajjad⁵ 

[1] ASTAR, Singapore Inst Mfg Technol, 2 Fusionopolis Way, Singapore 138634, Singapore

[2] Swansea Univ, Fac Sci & Engn, Bay Campus,Fabian Way, Swansea SA1 8EN, W Glam, Wales

[3] Univ New South Wales, Ctr Sustainable Mat, Sch Mat Sci & Engn, UNSW, Kensington Campus,High St, Sydney, NSW 2052, Australia

[4] Green Li Ion, 46 Kim Yam Rd,01-05, Singapore 239351, Singapore

[5] Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr, Singapore 117585, Singapore

关键词: Valence electron;    Transformation temperature;    Martensite;    Shape memory alloy;    TiAu;    TiIr;    Metals and alloys;    Intermetallics-Phase transition;   

DOI  :  10.1016/j.jallcom.2021.159399

来源: Elsevier

【 摘 要 】

Dependence of transformation temperatures of TiAu- and TiIr-based Intermetallics on Valence Electron Ratio (VER), number of valence electrons (e(v)) and average atomic number of the alloys (Z) were investigated. The alloys mostly have medium numbers of valence electrons (6.5 <= e(v) <= 7.3) near 7 with a limited number of TiAu-based alloys belonging to high valence electron group with e(v) more than 7.50 and relatively narrow range of average atomic numbers (Z = 41-53). The forward and reverse phase transformation temperatures, M-s and A(s) of AuTi-based alloys sharply increase with the average atomic number of the alloys. The investigated TiIr alloy compositions have almost similar average atomic numbers (49.5-50.2). Clear correlations between transformation temperatures and VER were found. M-s and A(s) both decrease from around 1550 degrees C to as low as 17 degrees C respectively, with increasing VER from 0.131 to 0. 174. The dependence of transformation temperatures on valence electron ratio is discussed based on the variations of elastic properties and atomic bonding due to composition change in these alloys. (c) 2021 Elsevier B.V. All rights reserved.

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