Effects of Ti/Al Ratio on Microstructure and Tensile Strength of Cast TiAl Alloys

Han Jiting1; Jiang Mingzhi2; Zhang Maicang1; Dong Jianxin1; Zhang Ji2

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Effects of Ti/Al Ratio on Microstructure and Tensile Strength of Cast TiAl Alloys
Issue 6, Pages: 475-477(2008)
Published： 2008 ，
DOI：

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[1]韩积亭,姜明智,张麦仓,董建新,张继.Ti/Al摩尔比对铸造TiAl合金组织及力学性能的影响[J].特种铸造及有色合金,2008(06):475-477+409.

Han Jiting1, Jiang Mingzhi2, Zhang Maicang1, et al. Effects of Ti/Al Ratio on Microstructure and Tensile Strength of Cast TiAl Alloys. [J]. Special Casting & Nonferrous Alloys (6):475-477(2008)
[1]韩积亭,姜明智,张麦仓,董建新,张继.Ti/Al摩尔比对铸造TiAl合金组织及力学性能的影响[J].特种铸造及有色合金,2008(06):475-477+409. DOI：

Han Jiting1, Jiang Mingzhi2, Zhang Maicang1, et al. Effects of Ti/Al Ratio on Microstructure and Tensile Strength of Cast TiAl Alloys. [J]. Special Casting & Nonferrous Alloys (6):475-477(2008) DOI：

摘要

以Ti-46.5Al-2.5V-1.0Cr合金为基础

研究了Ti/Al摩尔比的变化对合金组织及力学性能的影响。采用真空感应悬浮炉离心浇注制备了规格为100mm×65mm×10mm的TiAl试片。组织观察发现Ti/Al摩尔比为1.032和1.075时

都得到了柱状晶组织

后者组织更整齐

α2/γ层片取向一致性增强;摩尔比为1.121时

组织变成等轴晶组织

由粗大的全层片组织组成。对3种合金进行拉伸试验

发现Ti/Al摩尔比从1.075降低到1.032时

抗拉强度提高到600MPa

伸长率为1.0%;Ti/Al摩尔比提高到1.121时

其抗拉强度下降到440MPa。

Abstract

Effects of Ti/Al ratio on microstructure and tensile strength of Ti-46.5Al-2.5V-1.0Cr alloy have been investigated.The TiAl alloy samples with 100 mm in length and 65mm in width and 10mm in height were prepared with ISM（induction suspending melting）and centrifugal pouring.The results reveal that the columnar grains in the microstructure of TiAl alloy can be obtained with the Ti/Al ratio equal to 1.032 and 1.075

and microstructure of the TiAl alloy with Ti/Al ratio of 1.075 is more regular with more remarked orientation in α2/γ lamellar.Microstructure of the TiAl alloy that is composed of full lamellar structure is converted into equiaxed grain with the T/Al ratio of 1.121.Tensile testing reveals that the tensile strength and elongation of TiAl alloy is improved to 600 MPa and to 1.0%

respectively

with Ti/Al ratio decreasing from 1.075 to 1.032

while the tensile strength is decreased to 440 MPa with Ti/Al ratio increasing to 1.121.