Heat treatment of hot-isostatic-pressed 60NiTi shape memory alloy: Microstructure, phase transformation and mechanical properties

Zhou，Yinghao1; Yao，Xiyu2; Lu，Wenfei1; Liang，Dandan1; Liu，Xiaodi1; Yan，Ming2; Shen，Jun1

2022-04-30

10.1016/j.jmst.2021.10.005

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY   影响因子和分区

1005-0302

60NiTi alloy is considered to be a promising material for specialized bearing and gear applications due to its high hardness, strength, and low modulus. However, fabricating 60NiTi through conventional processing methods is challenging due to the brittleness and poor workability. In this study, 60NiTi with high relative density was successfully fabricated directly from pre-alloyed powder through hot isostatic pressing. The effects of solution and aging treatments on microstructure and mechanical properties were systematically studied by advanced characterization techniques. The hot-isostatic-pressed 60NiTi showed low average hardness and elastic strain due to the formation of a soft NiTi phase and B2 NiTi matrix. Solution treatment above 1000 °C dissolved the NiTi phase and promoted the formation of nanoscale NiTi precipitates, which significantly improved the hardness, strength, and elastic strain of 60NiTi. The formation of the NiTi phase can be mainly attributed to the driving forces induced by the chemical supersaturation and mechanical stress concentration. Finally, the phase transformation mechanisms during heat treatment and compression test were discussed.

Heat treatment Hot isostatic pressing Mechanical properties Ni-rich 60NiTi Phase transformation

SCI ; EI

英语

其他

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000773329000005

JOURNAL MATER SCI TECHNOL

20214311078798

Binary alloys ; Compression testing ; Fracture mechanics ; Hardness ; Hot isostatic pressing ; Microstructure ; Shape-memory alloy ; Sintering ; Titanium alloys

Titanium and Alloys:542.3 ; Physical Chemistry:801.4 ; Mechanics:931.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85117688570

Scopus

1.College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen,518060,China
2.Department of Materials Science and Engineering,Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Southern University of Science and Technology,Shenzhen,518055,China

Zhou，Yinghao,Yao，Xiyu,Lu，Wenfei,et al. Heat treatment of hot-isostatic-pressed 60NiTi shape memory alloy: Microstructure, phase transformation and mechanical properties[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,107:124-135.

Zhou，Yinghao.,Yao，Xiyu.,Lu，Wenfei.,Liang，Dandan.,Liu，Xiaodi.,...&Shen，Jun.(2022).Heat treatment of hot-isostatic-pressed 60NiTi shape memory alloy: Microstructure, phase transformation and mechanical properties.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,107,124-135.

Zhou，Yinghao,et al."Heat treatment of hot-isostatic-pressed 60NiTi shape memory alloy: Microstructure, phase transformation and mechanical properties".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 107(2022):124-135.