Mechanism of microstructure evolution and mechanical properties of high Nb-TiAl alloy in transition zone of laser-deposited Ti60/TiAl alloys

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-02-01 DOI:10.1016/j.msea.2024.147726

Jie Ding , Feng Chen , Qinghua Deng , Ruifeng Li , Shuai Xu , Liang Yang , Junpin Lin , Hui Chang

{"title":"Mechanism of microstructure evolution and mechanical properties of high Nb-TiAl alloy in transition zone of laser-deposited Ti60/TiAl alloys","authors":"Jie Ding , Feng Chen , Qinghua Deng , Ruifeng Li , Shuai Xu , Liang Yang , Junpin Lin , Hui Chang","doi":"10.1016/j.msea.2024.147726","DOIUrl":null,"url":null,"abstract":"<div><div>The transition zone of the Ti/TiAl alloy with a nominal composition of TiAl-5.5Nb was fabricated using laser melting deposition (LMD) of a powder mixture consisting of 30 % Ti60 and 70 % Ti-45Al-8Nb (wt. %). The microstructural evolution and mechanical properties were investigated. Upon thermal exposure at 650 °C and 800 °C, three distinct types of γ phase were observed: γ lamellae, γ blocks, and nanoscale γ clusters. Additionally, nanoscale ω particles were observed to coarsen at 650 °C, while they dissolved into the B2 phase after exposure at 800 °C. Notably, the tensile strength, yield strength, and plastic elongation of the specimens were significantly improved by 25.5 %, 23.9 %, and 47.2 %, respectively, following thermal exposure at 800 °C. This enhancement was attributed to the dissolution of ω particles and the subsequent precipitation of γ blocks.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"923 ","pages":"Article 147726"},"PeriodicalIF":6.1000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science and Engineering: A","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921509324016575","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The transition zone of the Ti/TiAl alloy with a nominal composition of TiAl-5.5Nb was fabricated using laser melting deposition (LMD) of a powder mixture consisting of 30 % Ti60 and 70 % Ti-45Al-8Nb (wt. %). The microstructural evolution and mechanical properties were investigated. Upon thermal exposure at 650 °C and 800 °C, three distinct types of γ phase were observed: γ lamellae, γ blocks, and nanoscale γ clusters. Additionally, nanoscale ω particles were observed to coarsen at 650 °C, while they dissolved into the B2 phase after exposure at 800 °C. Notably, the tensile strength, yield strength, and plastic elongation of the specimens were significantly improved by 25.5 %, 23.9 %, and 47.2 %, respectively, following thermal exposure at 800 °C. This enhancement was attributed to the dissolution of ω particles and the subsequent precipitation of γ blocks.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.