Effect of Ca or Y Addition on Hot Tearing Behavior of Mg-1.5Zn Alloys

doi:10.11901/1005.3093.2016.778

Chinese Journal of Materials Research

2017, Vol. 31

Issue (8): 561-568 DOI: 10.11901/1005.3093.2016.778

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Effect of Ca or Y Addition on Hot Tearing Behavior of Mg-1.5Zn Alloys

Zhi WANG¹(

), Ye ZHOU¹, Le ZHOU², Yizhou LI¹, Pingli MAO¹, Zheng LIU¹, Feng WANG¹

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2 School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China

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Zhi WANG, Ye ZHOU, Le ZHOU, Yizhou LI, Pingli MAO, Zheng LIU, Feng WANG. Effect of Ca or Y Addition on Hot Tearing Behavior of Mg-1.5Zn Alloys. Chinese Journal of Materials Research, 2017, 31(8): 561-568.

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Abstract

The effect of Ca or Y (2 % and 3 %, mass fraction, respectively) on hot tearing behavior of Mg-1.5% Zn alloy was investigated using a constrained rod casting (CRC) apparatus equipped with a load cell and data acquisition system. Tear volumes were quantified by wax penetration method. The experimental results show that the addition of Ca or Y could significantly decrease the hot tearing susceptibility (HTS) of the Mg-1.5Zn alloys due to that they could reduce the solidification temperature range (ΔT) for vulnerable regions. The reduction in ΔT may correspondingly imply the decrease of the HTS. In addition, the HTS further reduces with the higher amount of Ca or Y. It is observed that some of the formed cracks are possible to be healed by the subsequent refilling of the remained liquids during the final solidification stage, while the propagation of hot cracks along the dendritic and grain boundaries may be ascribed to the interdendritic separation or liquid film rupture.

Key words: metallic materials hot tearing susceptibility crack volume liquid film eutectic liquid

Received: 29 December 2016

ZTFLH:

TG146.2

Fund: Supported by National Natural Science Foundation of China (Nos.51504153, 51571145 & 51404137) and General Project of Scientific Research of the Education Department of Liaoning Province (No.L2015397)

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	Zhi WANG
	Ye ZHOU
	Le ZHOU
	Yizhou LI
	Pingli MAO
	Zheng LIU
	Feng WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.778 OR https://www.cjmr.org/EN/Y2017/V31/I8/561

Fig.1 Schematics of experimental setup (a) whole setup (b) thermocouple position for detecting onset of hot cracking during casting (unit: mm)

Fig.2 (a) Hot tearing susceptibility of Mg-1.5Zn-xCa(x=2, 3) and Mg-1.5Zn-xY(x=2, 3) alloys, (b) Curves of the solidification temperature changes according to the variation of solid fraction in vulnerbleregion

Table 1 Calculated temperature (℃) at different solid fractions with Scheil model for Mg-1.5Zn alloys with different Ca or Y contents

Fig.3 Contraction force and temperature as a function of time for Mg-1.5Zn-xCa (x=2, 3) and Mg-1.5Zn-xY (x=2, 3) alloys: (a) Mg-1.5Zn-2Ca; (b) Mg-1.5Zn-3Ca; (c) Mg-1.5Zn-2Y; (d) Mg-1.5Zn-3Y

Table 2 Information about the initiation and propagation of hot tearing for Mg-1.5Zn-xCa (x=2, 3) and Mg-1.5Zn-xY(x=2, 3) alloys

Table 3 Hot crack of Mg-1.5Zn system with different Ca and Y content

Fig.4 Hot crack volume of Mg-1.5Zn system with different Ca or Y contents

Fig.5 Hot crack volume as function of the ΔT for the Mg-1.5Zn alloys at different Ca and Y content

Fig.6 Microstructures near the tear region of the Mg-1.5Zn-xCa (x=2, 3) and Mg-1.5Zn-xY (x=2, 3) alloys: (a) Mg-1.5Zn-2Ca; (b) Mg-1.5Zn-3Ca; (c) Mg-1.5Zn-2Y; (d) Mg-1.5Zn-3Y

Fig.7 Fracture surfaces of hot tearing regions for (a) Mg-1.5Zn-2Ca, (b) Mg-1.5Zn-3Ca and (c) Mg-1.5Zn-2Y alloys (d) EDS analysis of Mg-1.5Zn-2Y

Table 4 Mole fractions of eutectic liquid in Mg-1.5Zn-xCa and Mg-1.5Zn-xY alloys

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