晶向和温度对含孔洞单晶TiAl-Nb合金断裂行为的影响

doi:10.11896/cldb.20030027

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Abstract The effects of crystal orientation and temperature on the fracture behaviour of single crystal TiAl-Nb alloys with void were studied by molecular dynamics method. The mechanical properties and internal micro-defect evolution of TiAl-Nb alloys under different conditions were analyzed. The results show that, the crystal orientation has a significant effect on the mechanical properties of TiAll-Nb alloys with voids, but has little effect on the fracture behaviour of it, which is maybe due to the reason that the solid solution strengthening effect is greater than that of dislocation because of the addition of Nb element. The higher the temperature lead to the smaller yield stress, yield strain and Young's modulus of TiAl-Nb alloys, the time is earlier when the dislocations first nucleate at the void, the fewer number and type of dislocations, as well as the time of the material failure is earlier.

Key words： TiAl-Nb alloys molecular dynamics void crystal orientation

Published: 04 June 2021

CLC number:

TG146

Fund:National Natural Science Foundation of China (51865027, 51665030), the Hongliu First-class Discipline Construction Project of Lanzhou University of Technology.

About author:: Peipei Kou is a postgraduate from the Lanzhou University of Technology. Her research concerns structure and material strength.
Ruicheng Feng is an associate professor and doctor from the Lanzhou University of Technology. His research concerns processing surface integrity assessment, structure and material strength.

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	KOU Peipei
	FENG Ruicheng
	LI Haiyan
	LI Longlong

Cite this article:

KOU Peipei,FENG Ruicheng,LI Haiyan, et al. Effect of Crystal Orientation and Temperature on Fracture Behaviour of Single Crystal TiAl-Nb Alloys with Void[J]. Materials Reports, 2021, 35(10): 10114-10119.

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http://www.mater-rep.com/EN/10.11896/cldb.20030027 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10114

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