Mg-11Gd-2Y-1.5Ag-0.5Zr合金的高温蠕变行为

doi:10.11896/cldb.19100170

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Abstract The creep behavior and microstructure evolution of Mg-11Gd-2Y-1.5Ag-0.5Zr alloy at 225—275 ℃/110—150 MPa were studied. The results show that the creep stress exponent n is 3.4 at 225 ℃/110—150 MPa, and the creep mechanism is dislocation slip mechanism. At 250 ℃/110—150 MPa, the creep stress exponent n is 4.7, and the creep mechanism is dislocation slip mechanism. At 275 ℃/110—130 MPa, the creep stress exponent n is 5.8, and the creep mechanism is dislocation slip mechanism. At 275 ℃/130—150 MPa, the creep stress exponent n is 10.5, the creep law of power law is invalid and the creep mechanism is complex. The results of creep activation energy Q on creep mechanism are basically consistent with the result of creep stress exponent n value. At the same temperature, the grain size increases with the increase of stress. Under the same stress, the grain size decreases with the increase of temperature. Under the high stress range of 110 MPa to 150 MPa, the alloy has good creep resistance under 250 ℃.

Key words： Mg-11Gd-2Y-1.5Ag-0.5Zr creep behavior stress exponent creep activation energy

Published: 23 March 2021

CLC number:

TG166.4

Fund:National Natural Science Foundation of China (51571084, 51171059).

About author:: Haikun Guan is a postgraduate student in Henan University of Science and Technology. His is mainly engaged in the research and improvement of the properties of rare earth magnesium alloys. And he has been granted 7 national invention patents.
Quan'an Li is a professor in Henan University of Science and Technology. His research interests are rare-earth magnesium alloys, rare-earth functional materials, and the surface modification by rare earth. He has presided over more than 10 projects including the Chinese National Natural Science Foundation, Henan Province Foundation for Outstanding Scholarship, Henan Pro-vince Foundation for Distinguished Young Scholarship. He has published more than 300 research papers, and he has been granted more than 20 national invention patents.

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	GUAN Haikun
	LI Quan'an
	CHEN Xiaoya
	ZHANG Shuai
	WANG Songbo

Cite this article:

GUAN Haikun,LI Quan'an,CHEN Xiaoya, et al. High Temperature Creep Behavior of Mg-11Gd-2Y-1.5Ag-0.5Zr Alloy[J]. Materials Reports, 2021, 35(6): 6126-6130.

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http://www.mater-rep.com/EN/10.11896/cldb.19100170 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6126

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