| 引用本文: | 罗小萍,张敏刚,柴跃生,李贝,周俊淇.铸态AZ81镁合金ECAP态组织与性能研究[J].材料科学与工艺,2012,20(3):72-76.DOI:10.11951/j.issn.1005-0299.20120314. |
| LUO Xiao-ping,ZHANG Min-gang,CHAI Yue-sheng,LI Bei,ZHOU Jun-qi.Microstructure and mechanical properties of cast AZ81 magnesium alloy processed by equal channel angular pressing[J].Materials Science and Technology,2012,20(3):72-76.DOI:10.11951/j.issn.1005-0299.20120314. |
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| 摘要: |
| 采用自制的90°模具，经Bc路径在温度为300℃下研究对比了铸态及不同道次的等通道挤压(ECAP)态AZ81镁合金微观组织和力学性能.结果表明ECAP随着挤压道次的增加，AZ81镁合金显微组织和力学性能发生显著变化.当挤压到4道次，平均晶粒尺寸由原来铸态的145um细化为9.6um，拉伸断口韧窝明显增多；抗拉强度从180 MPa提高到306 MPa，延伸率和硬度分别达到15.8％和142HL.分析表明，AZ81镁合金在高温挤压过程中Mg17Al12相粒子被破碎，并部分溶入基体,SymbolaA@-Mg基体与SymbolbA@- Mg17Al12相互相阻碍其晶粒长大,获得细小晶粒组织. |
| 关键词: 等通道转角挤压 AZ81镁合金 微观组织 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20120314 |
| 分类号:O647.3 |
| 基金项目:山西省科技攻关项目资助（20090322007） |
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| Microstructure and mechanical properties of cast AZ81 magnesium alloy processed by equal channel angular pressing |
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LUO Xiao-ping, ZHANG Min-gang, CHAI Yue-sheng, LI Bei, ZHOU Jun-qi
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College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China
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| Abstract: |
| The microstructure and mechanical of AZ81magnesium alloys before and after equal channel angular pressing (ECAP) were investiagted using seIf-made 90°die at 300 ℃in Bc path.The results showed that there was a better grain refinement with the increasing of pass number，the grain was continuously refined and mechanicaI properties were improved after the pressing.When squeezed four passes，the average grain size were refined from 145 um to 9.6um，tensile fractures presented the increment of dimpIe structure.tensiIe strength were changed from 180 Mpa to 306 MPa，hardness was of142HL，elongation was of 15.8％．The analysis showed that the grains were much smaller than that of the conventional alloys due to the β-Mg17Al12 phase broken,and partially integrated into the α-Mg matrix during pressing at high temperature.The mutual restriction between the two phases greatly reduced the speed of the dynamic recrystallization. |
| Key words: Equal channeI angular pressing Magnesium alloy Microstructure Mechanical properties |
