Superplastic Flow Behavior of Zr Base Bulk Metallic Glass in Supercooled Liquid Region

Acta Metall Sin

2004, Vol. 40

Issue (5): 518-522 DOI:

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Superplastic Flow Behavior of Zr Base Bulk Metallic Glass in Supercooled Liquid Region

SHEN Jun; WANG Gang; SUN Jianfei;CHEN Demin; XING Dawei; ZHOU Bide

School of Material Science and Engineering; Harbin Institute of Technology; Harbin 150001; Department of Aerospace Engineering; Harbin Engineering University; Harbin 150001

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SHEN Jun; WANG Gang; SUN Jianfei; CHEN Demin; XING Dawei; ZHOU Bide. Superplastic Flow Behavior of Zr Base Bulk Metallic Glass in Supercooled Liquid Region. Acta Metall Sin, 2004, 40(5): 518-522 .

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Abstract Isothermal tensile tests of Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass in supercooled liquid region are carried out at four characteristic temperatures of 616 , 636, 656 and 676 K which are in the vicinity of the end temperature of glass transition. Experimental results indicate that the superplastic flow behaviors of the material, viz., the flow stress and the elongation depend strongly on the testing temperature and tensile rate. The elongation increases firstly and then decreases with increasing rate and the maximum elongation reaches 1625% at 656 K and 5 mm/min. The strain rate sensitivity exponents determined by using Backofen method are 0.25, 0.65 and 0.93 at 636 , 656 and 676 K, respectively. The free volume model is used to interpret the observed superplastic flow behavior.

Key words: Zr-based bulk metallic glass supercooled liquid region superplasticity

Received: 29 May 2003

ZTFLH:

TG139.8

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	SHEN Jun
	WANG Gang
	SUN Jianfei
	CHEN Demin
	XING Dawei
	ZHOU Bide

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I5/518

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