MICROSTRUCTURE AND ROOM TEMPERATURE COMPRESSION PROPERTIES OF Mg82.13Zn13.85Y4.02 ALLOY SOLIDIFIED UNDER SUPER-HIGH PRESSURE

doi:10.3724/SP.J.1037.2013.00504

Acta Metall Sin

2014, Vol. 50

Issue (5): 594-600 DOI: 10.3724/SP.J.1037.2013.00504

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MICROSTRUCTURE AND ROOM TEMPERATURE COMPRESSION PROPERTIES OF Mg_82.13Zn_13.85Y_4.02 ALLOY SOLIDIFIED UNDER SUPER-HIGH PRESSURE

DONG Yun¹, LIN Xiaoping¹(

), XU Rui², FAN Zhibin¹, YE Jie¹, WANG Zhe²

1 Department of Materials Science and Engineering, Northeastern University, Shenyang 110819
2 State Key Laboratory of Metastable Materials Science and Technology, School of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004

Cite this article:

DONG Yun, LIN Xiaoping, XU Rui, FAN Zhibin, YE Jie, WANG Zhe. MICROSTRUCTURE AND ROOM TEMPERATURE COMPRESSION PROPERTIES OF Mg_82.13Zn_13.85Y_4.02 ALLOY SOLIDIFIED UNDER SUPER-HIGH PRESSURE. Acta Metall Sin, 2014, 50(5): 594-600.

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Abstract

By the investigation of the microstructures of Mg_82.13Zn_13.85Y_4.02 (mass fraction, %) alloy solidified under different pressure, it is found that the solidification microstructure of the alloy is consisted of a-Mg matrix, W-Mg₃Y₂Zn₃ phase and I-Mg₃YZn₆ phase. In the microstructure of the alloy solidified under ambient pressure, the networks of the secondary phases of eutectic-like and rod-like shape are distributed in the a-Mg interdendritic space. As the solidification pressure increases, eutectic network is disconnected gradually and the amount of eutectic is diminished and the solubility of Zn in a-Mg rises gradually. The results of the measurement of the mechanical properties show that the compression strength, the yield strength and the compressibility of the alloy sample solidified under ambient pressure is 344 MPa, 331 MPa and 16% respectively. However, the compression strength, the yield strength and the compressibility of the alloy sample solidified from 1250 ℃ under 6 GPa is 455 MPa, 426 MPa and 25%, respectively. The observation of fracture surfaces shows that, in the alloy solidified under high pressure, the cleavage surface of the compressed fracture is decreased, and the tear ridge and tearing dimple can be found. The degree of cleavage fracture is decreased.

Key words: Mg_82.13Zn_13.85Y_4.02 alloy high pressure solidification stress-strain curve cleavage surface

Received: 21 August 2013

ZTFLH:	TG146.2
	TG21

Fund: Natural Science Foundation of Hebei Province (No.E2013501096), Natural Science Foundation of Liaoning Province (No.20112063) and Projiect of Science and Technology of Northeastern University at Qinhuangdao (No.XNK201305)

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	Yun DONG
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	Jie YE
	Zhe WANG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00504 OR https://www.ams.org.cn/EN/Y2014/V50/I5/594

Fig.1

常压下Mg_82.13Zn_13.85Y_4.02合金的铸态组织及EDS分析

Fig.2

不同压力下凝固Mg_82.13Zn_13.85Y_4.02合金的XRD谱

Fig.3

Mg_82.13Zn_13.85Y_4.02合金热力学计算垂直截面相图

Fig.4

超高压下Mg_82.13Zn_13.85Y_4.02合金的凝固组织形貌

Fig.5

不同压力下凝固的Mg_82.13Zn_13.85Y_4.02合金的压缩应力-应变曲线

Fig.6

凝固压力对Mg_82.13Zn_13.85Y_4.02合金压缩性能的影响

Fig.7

Mg_82.13Zn_13.85Y_4.02合金室温压缩断口形貌

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