Influence of strength difference between soft and hard zones on hetero-deformation induced strengthening effect: Taking heterostructured β Ti alloy as an example
IF 6.2 2区 材料科学Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
{"title":"Influence of strength difference between soft and hard zones on hetero-deformation induced strengthening effect: Taking heterostructured β Ti alloy as an example","authors":"","doi":"10.1016/j.jmrt.2024.09.022","DOIUrl":null,"url":null,"abstract":"<div><div>The large strength difference between soft and hard zones in heterostructured materials is a double-edged sword: on the one hand, the effective back (<span><math><mrow><msub><mi>τ</mi><mi>b</mi></msub></mrow></math></span>) and forward stress (<span><math><mrow><msub><mi>τ</mi><mi>f</mi></msub></mrow></math></span>) are generated to produce hetero-deformation induced (HDI) strengthening and strain hardening effect. On the other hand, the micro-cracks tend to initiate and propagate along the interface to cause premature failure. Here we prepared three different heterostructured Ti-4.8Al-5.6Mo–3V-1.5Cr-1.6Fe alloys to reveal the influence of magnitude of strength difference between soft primary α phase (α<sub>p</sub>) and hard β matrix on its tensile strength and ductility. It demonstrates that only when the sum of applied stress (<span><math><mrow><msub><mi>τ</mi><mi>a</mi></msub></mrow></math></span>) and <span><math><mrow><msub><mi>τ</mi><mi>f</mi></msub></mrow></math></span> is greater than the yield strength of hard β matrix (<span><math><mrow><msubsup><mi>σ</mi><mi>y</mi><mrow><mi>h</mi><mi>a</mi><mi>r</mi><mi>d</mi></mrow></msubsup></mrow></math></span>), i.e., <span><math><mrow><msub><mi>τ</mi><mi>a</mi></msub><mo>+</mo><msub><mi>τ</mi><mi>f</mi></msub><mo>></mo><msubsup><mi>σ</mi><mi>y</mi><mrow><mi>h</mi><mi>a</mi><mi>r</mi><mi>d</mi></mrow></msubsup></mrow></math></span>, the alloy can obtain both high strength and ductility. Contrary, when <span><math><mrow><msub><mi>τ</mi><mi>a</mi></msub><mo>+</mo><msub><mi>τ</mi><mi>f</mi></msub><mo><</mo><msubsup><mi>σ</mi><mi>y</mi><mrow><mi>h</mi><mi>a</mi><mi>r</mi><mi>d</mi></mrow></msubsup></mrow></math></span>, the alloy exhibits a highest strength but a lowest ductility. These findings are expected to help with designing heterostructured materials for superior mechanical properties.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":null,"pages":null},"PeriodicalIF":6.2000,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Research and Technology-Jmr&t","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2238785424020295","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 large strength difference between soft and hard zones in heterostructured materials is a double-edged sword: on the one hand, the effective back () and forward stress () are generated to produce hetero-deformation induced (HDI) strengthening and strain hardening effect. On the other hand, the micro-cracks tend to initiate and propagate along the interface to cause premature failure. Here we prepared three different heterostructured Ti-4.8Al-5.6Mo–3V-1.5Cr-1.6Fe alloys to reveal the influence of magnitude of strength difference between soft primary α phase (αp) and hard β matrix on its tensile strength and ductility. It demonstrates that only when the sum of applied stress () and is greater than the yield strength of hard β matrix (), i.e., , the alloy can obtain both high strength and ductility. Contrary, when , the alloy exhibits a highest strength but a lowest ductility. These findings are expected to help with designing heterostructured materials for superior mechanical properties.
期刊介绍:
The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.