| 林子钦,朱红梅,杨堃.挤压及T5处理对Mg-Zn-Zr-Cu-Ca镁合金组织性能的影响[J].南华大学学报(自然科学版),2018,32(3):65~70.[LIN Ziqin,ZHU Hongmei,YANG Kun.Effects of Extrusion and T5 Treatment on Microstructure and Properties of Mg-Zn-Zr-Cu-Ca Magnesium Alloy[J].Journal of University of South China(Science and Technology),2018,32(3):65~70.] |
| 挤压及T5处理对Mg-Zn-Zr-Cu-Ca镁合金组织性能的影响 |
| Effects of Extrusion and T5 Treatment on Microstructure and Properties of Mg-Zn-Zr-Cu-Ca Magnesium Alloy |
| 投稿时间：2018-02-27 |
| DOI： |
| 中文关键词: 时效处理 变形镁合金 微观组织 显微硬度 腐蚀 |
| 英文关键词:aging treatment extruded Mg alloy microstructure microhardness corrosion |
| 基金项目:国家自然科学基金(51201088);湖南省自然科学基金(2015JJ3109) |
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| 摘要点击次数: 819 |
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| 中文摘要: |
| 对新型Mg-6Zn-0.6Zr-0.5Cu-0.5Ca铸造镁合金进行挤压形变,研究了挤压及T5时效处理对合金组织性能的影响.采用扫描电镜、能谱仪、X射线衍射仪、维氏显微硬度计、电化学工作站表征分析了合金的组织形貌、物相组成、显微硬度及腐蚀速率.结果表明:热挤压使铸态镁合金发生了动态再结晶,晶粒破碎,析出相明显细化并呈弥散分布,主要物相为α-Mg、MgZn2、MgZnCu、以及Mg2Ca相.T5时效处理使挤压态镁合金发生静态再结晶,随着时效时间的延长,析出相先细化后长大,当时效时间为12 h时组织最为致密均匀.铸态和原始挤压态试样的显微硬度值分别为72.94 HV0.1和76.4 HV0.1,随着T5时效处理的进行,合金显微硬度值呈先增后减的趋势,当时效时间为12 h时达到峰值(80.53 HV0.1).电化学测试结果表明,T5时效处理可有效降低镁合金的腐蚀速率,从而提高其耐蚀性. |
| 英文摘要: |
| The new Mg-6Zn-0.6Zr-0.5Cu-0.5Ca cast magnesium(Mg) alloy was subjected to extrusion deformation,and the effects of the extrusion process and T5 aging treatment on the microstructure and property of Mg alloy were also studied.The morphology,phase constitution,microhardness and corrosion rate of the alloy were characterized by SEM,EDS,XRD,Vickers microhardness tester and electrochemical workstation.The results show that the dynamic recrystallization of as-cast Mg alloy occurs during hot extrusion,the grains are broken and the precipitated phases are obviously refined and dispersed.The main phases are α-Mg,MgZn2,MgZnCu and Mg2Ca.T5 aging treatment leads to the static recrystallization of the as-extruded Mg alloy.With the increase of the aging time,the precipitates are refined first and then become coarsen.The densest and uniform microstructure occur at the aging time of 12 h.The microhardness for the as-cast and as-extruded specimens were 72.94 HV0.1 and 76.4 HV0.1,respectively.The microhardness increases first and then decreases after a T5 aging treatment,with the peak microhardness of 80.53 HV0.1 when the aging time reaches 12 h.The electrochemical test results show that T5 aging treatment can effectively reduce the corrosion rate of Mg alloy,thereby improving its corrosion resistance. |
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