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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution and tensile properties of conventional cast TiAl- based alloy with trace Ni addition
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Microstructure evolution and tensile properties of conventional cast TiAl- based alloy with trace Ni addition

机译：微量Ni添加的传统铸造TiAl基合金的组织演变和拉伸性能。

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摘要

The microstructure evolution and tensile properties of Ti-48Al-2Cr-2Nb-0.25Ni alloy fabricated by the induction skull melting (ISM) process were investigated. Results showed that the influence of trace Ni addition on the cast microstructure was slight, while the γ phase fraction increased relatively. After tensile tests at elevated temperature, nanoscale τ3particles precipitated within the lamellar colony in the gauge area. The τ3phase exhibited the specific orientation relationship with the α2and γ phases:(224̅2)τ3//(404̅1)α2//(113)γand[11̅00]τ3//[112̅0]α2//[1̅10]γ. At elevated temperature, the UTS and εfwere enhanced evidently by Ni addition than that of Ti-48Al-2Cr-2Nb alloy. Dislocations were pinned by the nanoscale τ3precipitates during tensile deformation at elevated temperature. The nanoscale τ3precipitates and increased γ phase fraction induced by Ni alloying could account for the notable tensile properties in the present work. The precipitation behavior and the main strengthening mechanism were analyzed and discussed in detail.
机译：研究了通过感应头骨熔化（ISM）工艺制备的Ti-48Al-2Cr-2Nb-0.25Ni合金的组织演变和拉伸性能。结果表明，微量Ni的添加对铸态组织的影响很小，而γ相分数相对增加。在高温下进行拉伸测试后，纳米级的τ3颗粒在表层区域的片状菌落中沉淀。 τ3相与α2相和γ相具有特定的取向关系：（224̅2）τ3//（404̅1）α2//（113）γ和[11̅00]τ3// [112̅0]α2// [1̅10]γ。与Ti-48Al-2Cr-2Nb合金相比，在高温下，添加Ni可以明显提高UTS和εf。在高温下拉伸变形期间，纳米级τ3沉淀物固定了位错。 Ni合金化引起的纳米级τ3沉淀和增加的γ相分数可以解释本研究中显着的拉伸性能。详细分析和讨论了降水行为和主要强化机理。

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