Effects of Notches on Fracture Behavior of Casting TiAl Alloys with Monolithic Orientation

Gao Fan1; Jing Yongjuan2; Wang Lei 1; Zhang Ji 2

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Effects of Notches on Fracture Behavior of Casting TiAl Alloys with Monolithic Orientation
Vol. 31, Issue 1, Pages: 5-7(2011)
Published： 2011 ，
DOI：

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[1]高帆,静永娟,王磊,张继.缺口对铸造单一取向层片组织TiAl合金断裂行为的影响[J].特种铸造及有色合金,2011,31(01):5-7+101.

Gao Fan1, Jing Yongjuan2, Wang Lei 1, et al. Effects of Notches on Fracture Behavior of Casting TiAl Alloys with Monolithic Orientation. [J]. Special Casting & Nonferrous Alloys 31(1):5-7(2011)
[1]高帆,静永娟,王磊,张继.缺口对铸造单一取向层片组织TiAl合金断裂行为的影响[J].特种铸造及有色合金,2011,31(01):5-7+101. DOI：

Gao Fan1, Jing Yongjuan2, Wang Lei 1, et al. Effects of Notches on Fracture Behavior of Casting TiAl Alloys with Monolithic Orientation. [J]. Special Casting & Nonferrous Alloys 31(1):5-7(2011) DOI：

摘要

研究了缺口对铸造单一取向层片组织TiAl合金断裂形貌特征和断裂机制的影响。通过对断口进行观察发现

缺口对单一取向的层片组织有较大影响。研究表明

在光滑试样的拉伸过程中

裂纹起源于试样内部

然后迅速扩展至断裂;在缺口试样的拉伸过程中

微裂纹于断口边缘产生

在切应力的作用下扩展、连接形成裂纹稳态扩展区

然后在正应变控制下从裂纹稳态扩展区向裂纹失稳扩展区过渡

同时试样失稳。

Abstract

Effects of notches on fracture morphology and fracture mechanism of casting TiAl alloy with monolithic orientation were investigated.Through observing fracture morphology

notches distinctly affect the lamellar structure of the alloy with monolithic orientation.During tensile testing process of smooth samples

crack is formed inside samples and then propagated to be broken

while for notched samples

micro-crack is generated at the edge of fracture

and then propagated in role of shearing stress to form steady propagation zone by each other connection.Furthermore

steady propagation zone is transformed into in-steady propagation under control of positive strain

so the crack propagation occurs.