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Effects of aging on the microstructures and mechanical properties of extruded AM50+xCa magnesium alloys

查看全文 作　　者：WANG [1]Qudong;PENG [1]Jianguo;Suéry [2]Michel;Jean-Jacques [2]Blandin 高影响力作者 机构地区：[1]National Engineering Research Centre of Light Alloys Net Forming, School of Materials Science and Engineering, Shanghai Jiaotong University,Shanghai 200030, China;[2]Institute National Polytechnique de Grenoble (INPG), Génie Physique et Mécanique des Matériaux (GPM2), UMR CNRS 5010, ENSPG, BP46, 38402 Saint-Martin d'Héres Cedex, France高影响力机构 出　　处：《Rare Metals》索引2006年第25卷第4期,共5页高影响力期刊 基　　金：This work was financially supported by the International Cooperation Foundation of Shanghai Science and Technology Committee of China (No. 02SL002) and the Regional Council of Rhone-Alpes of France. 摘　　要：The effects of aging treatment on the microstructures and mechanical properties of extruded AM50 + xCa alloys (x = 0, 1, 2 wt.%) were studied. The results indicated the secondary phase Mg17Al12 precipitated from the saturated α-Mg solid solution while Al2Ca changed slightly when the aging time was increased. The hardness of extruded AM50 + xCa al-loys increased initially to its peak, and then dropped to reach its original hardness with the increase in aging time. With the increase in aging temperature, the hardness of the AM50 + 2Ca alloy decreased, whereas the hardness of AM50 and AM50 + 1Ca alloys decreased in the initial stages of aging treatment and increased in the later stages of aging treatment. The tensile strengths of AM50 and AM50 + 1Ca alloys increased after aging treatment for the precipitation of Mg17Al12 phase, which increases the resistance against dislocation movement at the grain boundary; with increase in aging temperature, their tensile strengths in-creased. For AM50 + 2Ca alloy, the tensile strength declined after aging at 150°C and 175°C, while it increased slightly at 200°C. The ductility of AM50 + xCa alloys (x = 0, 1, 2 wt.%) declined after aging treatment. 关 键 词：AM50 + xCa合金 老化 挤出 机械性质 显微结构
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