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摘要：
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采用自行设计的模具,对铝合金2A50进行等径角挤压,模具的交角为120°,相邻两次挤压,试样顺时针方向旋转90°,并研究挤压后2A50铝合金的微观组织和物理性能。结果表明:在室温下可以对2A50铝合金实行多道次挤压,挤压后材料的晶粒平均尺寸下降到164 nm,达到亚微米级,同时,硬度明显增大,综合力学性能提高,但是电导率急剧下降,经过3次挤压后,2A50铝合金的电导率由原始的18784.63 S/M迅速下降到3553.27 S/M。
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2A50 aluminium alloy was applied to equal channel angular pressing.The die of 120° intersectant angle was designed.The specimen was rotated 90°clockwise between each pressing.The microstructure and physical character of 2A50 aluminium alloy were investigated after ECAP.The result shows that 2A50 aluminium alloy can be pressed many times under the room temperature successfully.The dimension of the grains drops to 164 nm and reaches the range of submicrocrystal level,meanwhile Vickers microhardness and the mechanical property rise greatly,but conductance declines markedly from 18784.63 S/M to 3553.27 S/M after 3 passes of ECAP.
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基金项目：
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江西省自然科学基金资助项目(0550091)
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作者简介：
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参考文献：
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[1]农登,黄少军,李林,等.等径角挤压法工艺路线影响材料显微组织演化的研究概况[J].广东有色金属学报,2006,16(3):202-205.
[2]张郑,王经涛,赵西成.7475铝合金ECAP的晶粒细化极限[J].中国有色金属学报,2004,14(5):741-745.
[3]郑立静,陈昌麒,周铁涛,等.ECAP细晶机制及对纯铝显微组织和力学性能的影响[J].稀有金属材料与工程,2004,33(12):1325-1328.
[4]毕见强,孙康宁,范润华,等.2A12铝块体超细晶材料的ECAP制备[J].人工晶体学报,2006,35(4):221-223.
[5]张郑,席明哲,王经涛.7475铝合金的ECAP组织细化研究[J].轻合金加工技术,2000,28(10):37-40.
[6]郑立静,张炎,曾梅光,等.ECAP制备的亚微7050铝合金的力学性能和微观结构[J].中国有色金属学报,2002,33(12):1012-1015.
[7]郑立静,邓江宁,张焱,等.采用ECAP制备亚微晶铝合金及其力学性能[J].东北大学学报,2002,23(7):694-696.
[8]刘先兰,张文玉.模具结构对等径角挤压材料显微组织的影响[J].锻压技术,2006,31(4):41-46.
[9]张郑,杜忠泽.7475铝合金ECAP变形及组织热稳定性[J].有色金属,2004,56(5):31-35.
[10]Takeshi Fujita,Zenji Horita.Characteristics of diffusion inAl±Mg alloys with ultrafine grain sizes[J].Phil-osophicalMagazine,2002,82(11):2249-2262.
[11]Zhang Z G,Watanabe Y,Kim I.Effect of texture evolutionon tensile properties of Al-Ni eutectic alloy fabricated by equalchannel angular pressing[J].Materials Science and Tech-nology,2005,2(6):708-714.
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