通过设计晶粒大小和析出物改变可变型 β 钛合金的拉伸和裂纹起始行为

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

摘要

微观结构在确定金属材料的机械性能方面起着至关重要的作用。为了在钛-15Mo-3Nb-3Al-0.2Si(TB8)合金中阐明这种相关性,我们通过热处理设计了各种微观结构,探索晶粒大小、析出物和偏析对新陈代谢β-钛合金拉伸试验中裂纹萌发行为的影响。830 ℃固溶处理后,具有等轴β晶粒的 TB8 合金显示出良好的断裂伸长率(30.2 ± 0.63%)。在拉伸试验中,绝热剪切带和β→α相变被激活,从而提高了相容变形能力;然而,相变导致边界应力集中,导致裂纹萌生。对于在 440 °C 下进行固溶和低温老化制备的样品,大晶粒、晶界元素偏析和不完全析出物导致极限抗拉强度和伸长率略有下降。在 520 °C 下固溶和老化后,β 晶粒中析出的短棒或/和片状 α 相有效地提高了极限抗拉强度(1398.71 ± 15.6 MPa)。边界的增加提供了界面或析出强化效应,但高密度位错也在β/α界面上积累,导致不稳定变形和裂纹萌生。这些发现加深了我们对微观结构与裂纹萌生之间相关性的理解,并为设计和定制可蜕变 β-Ti 合金的机械性能提供了依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Altering tensile and crack initiation behavior in a metastable β titanium alloy via designing grain size and precipitates

Microstructure can play a vital role in defining mechanical properties of metallic materials. To elucidate this correlation in the case of Ti–15Mo–3Nb–3Al-0.2Si (TB8) alloy, herein, we designed various microstructures via heat treatment exploring the effects of grain size, precipitates and segregation on crack initiation behavior during tensile tests in metastable β-Ti alloy. After solution treatment at 830 °C, the TB8 alloy with equiaxed β grain displayed a good fracture elongation of 30.2 ± 0.63%. The adiabatic shearing band and β→α phase transformation were activated to increase the compatible deformation capability during tensile testing; however, the phase transformation caused the stress concentration in the boundary, resulting in crack initiation. For the samples prepared using solution and low aging at 440 °C, large grain, elements segregation at grain boundary and incomplete precipitates induced a slight reduction in ultimate tensile strength and elongation. After solution and aging at 520 °C, the short-rod or/and lamellar α phase precipitated in β grain effectively enhancing ultimate tensile strength (1398.71 ± 15.6 MPa). The increased boundaries provided the interface or precipitation strengthening effect, but high-density dislocations were also accumulated at the β/α interface, causing unstable deformation and crack initiation. These findings advance our understanding of the correlation between microstructure and crack initiation, and provide a basis for designing and customizing the mechanical properties of metastable β-Ti alloy.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
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.
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