超高压凝固Mg82.13Zn13.85Y4.02合金的组织及室温压缩性能*

doi:10.3724/SP.J.1037.2013.00504

金属学报

2014, Vol. 50

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

本期目录 | 过刊浏览

超高压凝固Mg_82.13Zn_13.85Y_4.02合金的组织及室温压缩性能^*

董允¹, 林小娉¹(

), 徐瑞², 樊志斌¹, 叶杰¹, 王哲²

1 东北大学材料与冶金学院, 沈阳 110819
2 燕山大学材料科学与工程学院, 亚稳材料制备技术与科学国家重点实验室, 秦皇岛 066004

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

引用本文:

董允, 林小娉, 徐瑞, 樊志斌, 叶杰, 王哲. 超高压凝固Mg_82.13Zn_13.85Y_4.02合金的组织及室温压缩性能^*[J]. 金属学报, 2014, 50(5): 594-600.
Yun DONG, Xiaoping LIN, Rui XU, Zhibin FAN, Jie YE, Zhe WANG. MICROSTRUCTURE AND ROOM TEMPERATURE COMPRESSION PROPERTIES OF Mg_82.13Zn_13.85Y_4.02 ALLOY SOLIDIFIED UNDER SUPER-HIGH PRESSURE[J]. Acta Metall Sin, 2014, 50(5): 594-600.

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摘要:

研究不同压力凝固条件下Mg_82.13Zn_13.85Y_4.02 (质量分数, %)合金微观组织和力学性能, 发现合金的凝固组织是由a-Mg基体, W-Mg₃Y₂Zn₃和I-Mg₃YZn₆相组成. 其中, 常压下凝固组织中的a-Mg枝晶间分布着由共晶组织形态和杆状第二相组成的网状结构. 随着凝固压力的增大, 共晶网逐渐断开, 其数量逐渐减少, a-Mg基体中Zn的溶解度逐渐增大. 常压凝固合金的室温压缩强度为344 MPa, 屈服强度为331 MPa, 相对压缩率为16%. 6 GPa, 1250 ℃凝固合金的室温压缩强度可达455 MPa, 屈服强度426 MPa, 相对压缩率为25%. 常压凝固合金的压缩断裂模式为典型的解理断裂, 且解理面大而光滑平整, 高压凝固合金的压缩断口解理面较小, 并出现撕裂岭和类似“撕裂韧窝”的形貌特征, 解理断裂的程度有所降低.

关键词 ： Mg_82.13Zn_13.85Y_4.02合金, 高压凝固, 应力-应变曲线, 解理面

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

收稿日期: 2013-08-21

ZTFLH:

TG146.2

基金资助:* 河北省自然科学基金项目E2013501096, 辽宁省自然科学基金项目20112063和东北大学秦皇岛分校科技支撑项目XNK201305资助

作者简介: null

董允, 男, 1959年生, 教授, 博士

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

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