Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

A large compressive recoverable strain induced by heterogeneous microstructure in a Ni50.6Ti49.4 shape memory alloy via laser powder bed fusion and subsequent aging treatment

Ma, Chenglong, Gu, Dongdong, Setchi, Rossitza, Dai, Donghua, Wu, Meiping, Ma, Shuai and Miao, Xiaojin 2022. A large compressive recoverable strain induced by heterogeneous microstructure in a Ni50.6Ti49.4 shape memory alloy via laser powder bed fusion and subsequent aging treatment. Journal of Alloys and Compounds 918 , 165620. 10.1016/j.jallcom.2022.165620
Item availability restricted.

[thumbnail of JAC manuscript.pdf] PDF - Accepted Post-Print Version
Restricted to Repository staff only until 26 May 2023 due to copyright restrictions.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (2MB)

Abstract

Laser induced highly metastable microstructure provides the possibility for the tunable precipitation behavior and mechanical/functional properties via direct aging treatment. In this paper, Ni-rich NiTi-based samples were fabricated by laser powder bed fusion (LPBF) and then were directly aged for different aging times that spanning three time-scales (10 min-100 h). The results showed that through the aging treatment, a heterogeneous microstructure consisting of Ti4Ni2Ox nanoparticles, nanoscale Ni-rich precipitates, dislocation structures, and martensitic twin variants formed in the matrix. Due to the change in the elastic strain field, the short time aging treatment tended to induce (001) compound twins, while the long time aging assisted in the formation of< 011 > type II twins. The temperature-induced and deformation-induced phase transformation behavior were further studied. With the progress of precipitates, it was found that a rapid evolution from a single-stage phase transformation to a multi-stage one occurred. During the cyclic compression, the sample aged for 1 h showed the most excellent superelasticity with initial recoverable strain of 0.089 and steady recoverable strain of 0.087, as well as good cyclic stability.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0925-8388
Date of First Compliant Deposit: 6 June 2022
Date of Acceptance: 24 May 2022
Last Modified: 02 Aug 2022 04:50
URI: https://orca.cardiff.ac.uk/id/eprint/150219

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics