eprintid: 10198905
rev_number: 10
eprint_status: archive
userid: 699
dir: disk0/10/19/89/05
datestamp: 2024-10-25 08:35:23
lastmod: 2024-10-25 08:37:23
status_changed: 2024-10-25 08:35:23
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Zhang, Xiaolong
creators_name: Liu, Chaozong
creators_name: Wang, Shuo
creators_name: Jiang, Yue
creators_name: Chen, Hongyi
creators_name: Zhang, Qingquan
creators_name: Li, Qiang
creators_name: Huang, Jie
creators_name: Zhang, Zhihui
title: Assessment of the mechanical and functional properties of nitinol alloys fabricated by laser powder bed fusion: Effect of strain rates
ispublished: pub
divisions: UCL
divisions: B02
divisions: B04
divisions: C10
divisions: D16
divisions: F48
divisions: F45
divisions: G86
keywords: Strain rates; Nitinol SMAs; Laser powder bed fusion; Multi-scale characterization
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Laser Powder Bed Fusion-fabricated (LPBFed) nitinol shape memory alloys (SMAs), which undergo solid-solid phase transitions between austenite and martensite, are increasingly utilized in various technical fields and are subjected to a wide range of strain rates during service. This study pioneers the investigation of a comprehensive range of strain rates (3.16 × 10−6-10°/s), encompassing the strain rates used in quasi-static tensile tests reported in the existing literature, to understand their effects on the deformation mechanisms of LPBFed nitinol SMAs. Utilizing multi-scale characterization, including macroscopic mechanical evaluation, mesoscale analysis of deformation surfaces, and microscale examination of microstructure, we reveal distinct deformation behaviors at different strain rates. At lower strain rates, the mechanical behavior exhibits little sensitivity to changes in the strain rates, with stress-induced martensite transformation or martensite detwinning and variant reorientation being the primary deformation mechanisms. However, at higher strain rates, we observe significant variability in mechanical response, dominated by dislocation-induced slip and reduced occurrence of stress-induced martensitic transformation. This study provides the first comprehensive database for the engineering applications of LPBFed Nitinol SMAs and offers critical insights into optimizing mechanical and functional assessments for these advanced materials.
date: 2024-11
date_type: published
publisher: Elsevier BV
official_url: http://dx.doi.org/10.1016/j.msea.2024.147358
full_text_type: other
language: eng
verified: verified_manual
elements_id: 2328184
doi: 10.1016/j.msea.2024.147358
lyricists_name: Chen, Hongyi
lyricists_name: Huang, Jie
lyricists_name: Liu, Chaozong
lyricists_id: HCHEB60
lyricists_id: JHUAN03
lyricists_id: CLIUX47
actors_name: Liu, Chaozong
actors_id: CLIUX47
actors_role: owner
full_text_status: restricted
publication: Materials Science and Engineering: A
volume: 916
article_number: 147358
issn: 0921-5093
citation:        Zhang, Xiaolong;    Liu, Chaozong;    Wang, Shuo;    Jiang, Yue;    Chen, Hongyi;    Zhang, Qingquan;    Li, Qiang;         ... Zhang, Zhihui; + view all <#>        Zhang, Xiaolong;  Liu, Chaozong;  Wang, Shuo;  Jiang, Yue;  Chen, Hongyi;  Zhang, Qingquan;  Li, Qiang;  Huang, Jie;  Zhang, Zhihui;   - view fewer <#>    (2024)    Assessment of the mechanical and functional properties of nitinol alloys fabricated by laser powder bed fusion: Effect of strain rates.                   Materials Science and Engineering: A , 916     , Article 147358.  10.1016/j.msea.2024.147358 <https://doi.org/10.1016/j.msea.2024.147358>.      
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10198905/1/Liu_IJMACTOOL-D-24-00452.pdf