文摘
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随着等通道转角挤压(ECAP)次数的增加,Mg-8Li-1Al(质量分数,%)合金的室温拉伸强度和塑性同时增加,对应1,2,3,4次ECAP,合金的屈服强度分别为169,185,196和198 MPa,延伸率分别为12%,14%,25和27%。微观组织分析表明,ECAP方法在细化两相组织、提高合金强度的同时,还改善了α相组织的均匀性和等轴性,并使各晶粒间的取向差逐渐增大。这种处在非平衡状态的、具有较大取向差的晶界结构,在室温拉伸变形过程中可激活晶界滑移或晶粒转动等变形方式,进而使材料的塑性随道次增加而得到提高。 |
其他语种文摘
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Measurement of room temperature tensile properties of Mg-8Li-lAl (mass fraction, %) alloy processed by equal channel angular pressing (ECAP) shows that the strength and elongation increase simultaneously with increasing the passes of ECAP. To ECAP 1, 2, 3 and 4 passes, the corresponding yield stresses and elongations of the alloy are 169, 185, 196, 198MPa and 12%, 14%, 25%, 27% respectively. The analysis of the microstructures reveals that ECAP process could not only refine the a and /3 phases, but also improve the homogeneity of a phase microstructure and increase the misorientations between grains in both phases. This kind of grain boundaries which are in non-equilibrium state and with relatively large misorientation might stimulate new deformation modes, such as grain boundary sliding or grain rotation during the room temperature tensile tests, as a result, the ductility of the alloy was improved. |
来源
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金属学报
,2003,39(8):795-798 【核心库】
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关键词
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镁合金
;
等通道转角挤压
;
拉伸性能
;
晶粒细化
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地址
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中国科学院金属研究所, 沈阳材料科学国家(联合)实验室, 沈阳, 110016
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0412-1961 |
学科
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金属学与金属工艺 |
基金
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国家自然科学基金
;
国家973计划
;
辽宁省沈阳市科技局国际合作项目
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文献收藏号
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CSCD:1266867
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