机械合金化和放电等离子烧结制备NbMoCrTiAl高熵合金

doi:10.11896/cldb.18020113

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Abstract The effects of ball milling speed, ball-to-powder ratio and milling duration on the phase, morphology and particle size of NbMoCrTiAl high entropy alloy powders were investigated. The microstructure and hardness of NbMoCrTiAl high-entropy alloys prepared at different spark plasma sintering temperatures were investigated. The results indicated that incomplete alloying of powders occurred at the rotational speed of 300 r/min, ball-to-powder ratio of 10∶1 and milling duration of 60 h. Only the ball-to-powder ratio reached 12∶1 under the milling conditions of 300 r/min and 50 h can complete alloying of powders be achieved. Moreover, NbMoCrTiAl high entropy alloy with single BCC solid solution could be obtained on condition that the ball milling speed exceeded 400 r/min, with the ball-to-powder ratio of 10∶1 and milling duration of 50 h. The alloying sequence of elements in NbMoCrTiAl high entropy alloy was Al→Ti→Cr→Nb→Mo. The precipitation and dissolution change of the second phases occurred in NbMoCrTiAl high entropy alloy during the SPS process. With the rising sintering temperature(1 400—1 600 ℃), the second phases presented a decrease in number and an increase in size, which leaded to the gradual reduction of hardness.

Key words： entropy alloy NbMoCrTiAl mechanical alloying spark plasma sintering

Published: 16 May 2019

CLC number:

TG146.4

Fund:This work was financially supported by the National Natural Science Foundation of China (51475161).

About author:: Jianhui Yan served in School of Materials of Science and Engineering of Hunan University of Science and Technology. He is currently a professor and doctoral supervisor. He obtained Ph.D. degree in state key laboratory of powder Metallurgy of Central South University. He has published more than 60 journal papers, applied 6 national invention patents and 4 of them were autho-rized. His major research interests are development of high temperature structural materials, protection of high temperature oxidation resistance for materials, wear resistance technology for materials surface, strengthening and toughening of materials. He presided National Natural Science Fund of China, Natural Science Fund of Hunan pro-vince, and Science and Technology Project of Hunan province, and so on.

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	YAN Jianhui
	LI Kailing
	WANG Yi
	QIU Jingwen

Cite this article:

YAN Jianhui,LI Kailing,WANG Yi, et al. NbMoCrTiAl High-entropy Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering[J]. Materials Reports, 2019, 33(10): 1671-1675.

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http://www.mater-rep.com/EN/10.11896/cldb.18020113 OR http://www.mater-rep.com/EN/Y2019/V33/I10/1671

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