铸态Ti44Al6Nb1.0Cr2.0V合金的显微组织及室温拉伸性能（英文）

发布时间：2018-01-29 22:26

本文关键词： 钛铝合金铸态微观结构拉伸性能微裂纹　出处：《Transactions of Nonferrous Metals Society of China》2015年04期 　论文类型：期刊论文

【摘要】：设计了新型Ti44Al6Nb1.0Cr2.0V合金,并采用真空自耗法熔炼制备尺寸为d225 mm×320 mm的合金锭。结果表明,其层片厚度在780~1830μm范围。此合金表现为一种改进的近片层(M-NL)微观结构,主要由(α2+γ)层片结构和较多的(B2+等轴γ)小块状结构组成。合金的室温拉伸性能适中,在选取的12个研究位置中,5#位置其平均性能达到UTS=499 MPa和σ=0.53%。合金表现出明显的脆性断裂特征,其中穿晶穿片层断裂模式较为普遍。室温拉伸实验后,在γ相中可以观察到101]和1/2112]超位错。大量Nb、Cr、V等元素的加入造成了合金较低的堆垛层错能,这对合金塑性的提升是有益的,但铸造微裂纹导致了合金提早断裂,对性能造成很大影响。
[Abstract]:A new type of Ti44Al6Nb1.0Cr2.0V alloy was designed, and the alloy ingot with the size of d225mm 脳 320mm was prepared by vacuum consumable melting. The thickness of the alloy is in the range of 780 渭 m and 1830 渭 m. The alloy exhibits an improved near lamellar M-NL microstructure. The alloy is mainly composed of (伪 2 纬) lamellar structure and more small block structure of B 2 equiaxed 纬. The tensile properties of the alloy at room temperature are moderate, in the selected 12 study positions. The average mechanical properties of the alloy are up to UTS=499 MPa and 蟽 0.53.The alloy exhibits obvious brittle fracture characteristics, among which the transgranular translamellar fracture mode is more common. Superdislocations of 101] and 1/2112] can be observed in 纬 phase. The addition of a large number of elements such as NB _ (1) Cr ~ (2 +) V causes the low stacking fault energy of the alloy, which is beneficial to the improvement of the plasticity of the alloy. However, casting microcracks lead to early fracture of the alloy, which has a great impact on the properties.
【作者单位】：哈尔滨工业大学材料科学与工程学院;
【基金】：Project(2011CB605504)supported by the National Basic Research Program of China Project(NCET-12-0153)supported by the Program of New Century Excellent Talents in University Project(51274076)supported by the National Natural Science Foundation of China
【分类号】：TG146.23
【正文快照】： 1 IntroductionTi Al-based alloys are considered as the mostpromising materials for the application in the aviationand aerospace industry due to their low density,highspecific strength,excellent high temperature mechanicalproperties and so on[1-6].Many ki

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