Study on compression deformation, damage and fracture behavior of TiAl alloys. Part II. Fracture behavior

doi:10.1016/j.msea.2008.12.012

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	Study on compression deformation, damage and fracture behavior of TiAl alloys. Part II. Fracture behavior
	Cao, R.1,2; Li, L.1,2; Chen, J.H.1,2; Zhang, J.3
刊名	Materials Science and Engineering A
	2010-04-25
卷号	527 期号:10-11 页码:2468-2477
关键词	Aluminum alloys Binary alloys Compression testing Deformation Fracture Fracture mechanics Fracture toughness Shear flow Strain rate Tensile strength Titanium alloys Compression deformation Compression properties Deformation and damages Fracture behavior Microscopic features Shear yield strength Strength and plasticities TiAl alloy
ISSN号	09215093
DOI	10.1016/j.msea.2008.12.012
英文摘要	Compression deformation, damage and fracture behaviors of TiAl alloys are studied systematically. The deformation and damage processes in compression tests of TiAl specimens are detailed in Part I and the fracture behaviors are described and discussed here the Part II of this work. Results indicate that: the compression properties are superior to the tensile properties and specially show a much higher fracture strength and plasticity. The macroscopic features of the fracture surfaces indicate that the fracture mechanisms are different between the full lamellar (FL) alloy and the duplex (DP) alloy. In FL alloy, the shear cracking dominates the fracture, and the shear crack extends throughout the whole specimen. At both ends of the specimen, the shear cracks initiate and propagate in directions inclined to the compression axis with an angle near 45°. In the middle of the specimen, the shear cracks propagate parallel to the compression axis. While in the DP alloy after two short shear cracks initiate and extend at both ends, the longitudinal normal cracking is triggered and propagates parallel to the compression axis and dominates the fracture. In the microscopic features the regions of shear cracking show the smooth interlamellar shear fracture facets with some translamellar shear fracture steps. The longitudinal normal cracking in DP specimens shows mixed interlamellar and translamellar cleavage fracture facets. Effect of loading rate manifests itself in increasing the shear yield strength of FL and the fracture strength of DP alloys. © 2009.
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000276137600003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/111555]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou, 730050, China; 2.Key Laboratory of Non-ferrous Metal Alloys, The Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, China; 3.Central Iron and Steel Research Institute, Beijing, 100081, China
推荐引用方式 GB/T 7714	Cao, R.,Li, L.,Chen, J.H.,et al. Study on compression deformation, damage and fracture behavior of TiAl alloys. Part II. Fracture behavior[J]. Materials Science and Engineering A,2010,527(10-11):2468-2477.
APA	Cao, R.,Li, L.,Chen, J.H.,&Zhang, J..(2010).Study on compression deformation, damage and fracture behavior of TiAl alloys. Part II. Fracture behavior.Materials Science and Engineering A,527(10-11),2468-2477.
MLA	Cao, R.,et al."Study on compression deformation, damage and fracture behavior of TiAl alloys. Part II. Fracture behavior".Materials Science and Engineering A 527.10-11(2010):2468-2477.