孔洞对含Nb单晶γ-TiAl合金力学性能的影响

doi:10.11896/cldb.19070089

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Abstract The effects of void size, number and position on the mechanical properties of single crystal γ-TiAl alloys containing Nb were studied by mole-cular dynamics method. The relationship between the micro-defect evolution inside the material and the change of the mechanical properties of the material was analyzed. The results indicate that the yield strength and elastic modulus of single crystal γ-TiAl alloys are increased with the addition of Nb element. With the increase of void size and number, the yield strength of single crystal γ-TiAl alloys containing Nb decreases in sequence, which is mainly due to the voids as a dislocation source in the stretching process, which provides conditions for the nucleation and emission of dislocations. When several voids are distributed parallel to the tensile direction, the yield stress of the material is the largest. And when the distribution of the voids perpendicular to the tensile direction, the yield stress of the material is the smallest, which is the most likely to lead to the failure of the material.

Key words： γ-TiAl alloys molecular dynamics void mechanical property dislocation

Published: 14 July 2020

CLC number:

TG146

Fund:This work was financially supported by the Natural Science Foundation of China (51865027, 51665030), the Hongliu First-class Discipline Construction Project of Lanzhou University of Technology.

About author:: Peipei Kouis a postgraduate from the Lanzhou University of Technology. Her research concerns structure and material strength.
Ruicheng Fengis 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
	WANG Maomao
	QI Yongnian

Cite this article:

KOU Peipei,FENG Ruicheng,LI Haiyan, et al. Effects of Voids on Mechanical Property of Single Crystal γ-TiAl Alloys Containing Nb[J]. Materials Reports, 2020, 34(14): 14140-14146.

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http://www.mater-rep.com/EN/10.11896/cldb.19070089 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14140

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