Effect of suction casting and thermomechanical processing on the microstructure and martensitic transformation of a TiNiCuNb shape memory alloy

被引：1

作者：

Silva, Jessica Dornelas ^{[1
,2
]}

Sado, Mariana Lumi Ichihara ^{[2
]}

Santos, Leandro Arruda ^{[1
]}

dos Santos, Dilson Silva ^{[2
]}

Buono, Vicente Tadeu Lopes ^{[1
]}

机构：

[1] Univ Fed Minas Gerais UFMG, Dept Met & Mat Engn, Belo Horizonte, MG, Brazil

[2] Univ Fed Rio De Janeiro UFRJ, Dept Met & Mat Engn, Rio De Janeiro, RJ, Brazil

来源：

INTERMETALLICS | 2024年 / 175卷

关键词：

TiNi-based shape memory alloys; Martensitic transformation; Heat treatment; Fast cooling solidification; Elastocaloric materials; MECHANICAL-PROPERTIES; NITI; FATIGUE; REFRIGERATION; STABILITY; EVOLUTION; BEHAVIOR; FILMS;

D O I：

10.1016/j.intermet.2024.108510

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

TiNiCu-based superelastic alloys are promising for use as elastocaloric materials. In this study, we aim to produce a TiNiCuNb alloy with a refined microstructure, adequate Af, and latent heat for room-temperature application. For that, a Ti48Ni38Cu10Nb4 alloy was produced via arc melting followed by fast-cooling vacuum-suction casting (SC). Compared to the material that was only arc-melted, a refined and more uniform microstructure was obtained. This microstructure exhibited high stability during superelastic cycling and an Af much lower than room temperature. Further thermomechanical processing and heat-treatment (HT) were used to adjust the martensitic transformation (MT) critical temperatures and enthalpy. Increasing Af and enthalpy were observed with increasing HT temperatures. It was discussed that, besides the effect of the development of recovery/recrystallization mechanisms, the Nb content in the TiNi matrix could impact these properties. An Af close to, but smaller than room temperature, was obtained for the alloy heat-treated at 450 degrees C, with a MT enthalpy of 9.9 J/g.

引用

页数：10

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