Effects of microcrack-damage on fracture behavior of TiAl alloy part I displacement-controlled tensile test

被引：5
作者：
Cao, R. [1 ,2 ]
Zhu, H. [2 ]
Chen, J. H. [1 ,2 ]
Zhang, J. [3 ]
Ya, H. J. [2 ]
机构：
[1] Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Metal Mat, Lanzhou 730050, Peoples R China
[2] Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Metal Mat, Lanzhou 730050, Peoples R China
[3] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 474卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; damage; fracture behavior; microcrack;
D O I：
10.1016/j.msea.2007.06.055
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Specimens of a directionally solidified cast of a fully lamellar TiAl alloy were tensile tested using displacement-controlled procedure. Numbers of microcracks were measured for specimens after they were subjected to various preload-unload processes. Combined with detailed fracture surface observations, the following effects of microcrack-damage on fracture behavior of TiAl alloy are proposed-(1) Volumetric effect: the apparent plastic elongation incorporates both plastic strain and the elongation caused by microcracks. (2) Volumetric effect: microcracks produced in entire specimen volume decrease the apparent elastic modulus and produce a stress-softening sector of the load-displacement curve just before final fracture. (3) Facial effect: microcracks extended on a weakest cross-section decrease and determine the fracture load. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1 / 14
页数：14
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