EFFECT OF SPECIMEN TEMPERATURE ON CRYSTALLIZATION DURING LASER REMELTITNG Zr55Cu30Al10Ni5 BULK METALLIC GLASS

doi:10.3724/SP.J.1037.2013.00166

Acta Metall Sin

2013, Vol. 49

Issue (8): 925-931 DOI: 10.3724/SP.J.1037.2013.00166

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EFFECT OF SPECIMEN TEMPERATURE ON CRYSTALLIZATION DURING LASER REMELTITNG Zr₅₅Cu₃₀Al₁₀Ni₅ BULK METALLIC GLASS

YANG Gaolin, LIN Xin, HU Qiao, SONG Menghua, WANG Zhitai, HUANG Weidong

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

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YANG Gaolin, LIN Xin, HU Qiao, SONG Menghua, WANG Zhitai, HUANG Weidong. EFFECT OF SPECIMEN TEMPERATURE ON CRYSTALLIZATION DURING LASER REMELTITNG Zr₅₅Cu₃₀Al₁₀Ni₅ BULK METALLIC GLASS. Acta Metall Sin, 2013, 49(8): 925-931.

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Abstract

Zr₅₅Cu₃₀Al₁₀Ni₅ bulk metallic glasses were remelted by pulsed laser at liquid N (Ar) cooling, room temperature and 473 K. The results show that the effect of specimen temperatures on the crystallization of specimens during laser remelting metallic glasses depends on the Ar blowing. If there is no Ar blowing, the crystallization of the specimen during laser remelting under liquid Ar cooling and room temperature is similar while the molten pool is deeper for liquid Ar cooling. And the specimen remelted at 473 K was most seriously crystallized with the deepest molten pool. But comparing the specimen at room temperature, the crystallization of the specimen at liquid N was suppressed during laser remelting with Ar blowing. The effects of specimen temperatures on the crystallization of metallic glasses during laser remelting are: First, the lower specimen temperature can increase the cooling rate of specimen and therefore reduce its crystallization. Secondly, the lower specimentemperature makes the atmosphere around the specimen cooled down, reduces the shielding effect of plasma and increases the actual laser energy input into the specimen, resulting in more serious crystallization of the specimen. If there is Ar blowing, the atmosphere temperatures are similar to that at the liquid Ar cooling leading to the crystallization of the specimen to reduced. If there is no Ar blowing, the atmosphere temperature is similar to the temperature of specimen itself. In this case, the crystallization of the specimens is jointly determined by the temperature of the specimen itself and the atmosphere temperature around the specimens, which is not monotonous.

Key words: Zr₅₅Cu₃₀Al₁₀Ni₅ bulk metallic glass specimen temperature laser remelt crystallization

Received: 07 April 2013

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	Articles by authors
	YANG Gaolin
	LIN Xin
	HU Qiao
	SONG Menghua
	WANG Zhitai
	HUANG Weidong

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00166 OR https://www.ams.org.cn/EN/Y2013/V49/I8/925

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