挤压比对2014铝合金组织及性能的影响
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摘要
为了研究2014铝合金经不同挤压比挤压后组织及性能变化规律,采用挤压比为9∶1和16∶1在挤压温度420℃、挤压速度1.34 mm/s的试验条件对2014铝合金进行挤压。结果表明,在挤压比为9∶1时,动态再结晶现象不显著,铸态组织缺陷未能完全消除,晶粒尺寸较大;在挤压比为16∶1时,铸态组织缺陷大部分消除,动态再结晶明显,晶粒细小,第二相分布均匀,形变强化作用大,试样无裂纹;挤压比为16∶1的2014铝合金性能优于挤压比9∶1的2014铝合金性能。
In order to study the changes of structure and properties of 2014 aluminum alloy after extrusion at different extrusion ratios, extrusion ratios of 9∶1 and 16∶1 were used to extrude 2014 aluminum alloy at 420 ℃ and 1.34 mm/s extrusion speed. The results show that when extrusion ratio is 9∶1, the phenomenon of dynamic recrystallization is not significant, the defects of as-cast structure cannot be eliminated completely, and the grain size is larger; when extrusion ratio is 16∶1, the defects of as-cast structure are mostly eliminated, dynamic recrystallization is obvious, the grain size is fine, the second phase distribution is uniform, the deformation strengthening effect is large, and the specimen has no cracks; the properties of 2014 aluminum alloy with extrusion ratio of 16∶1 are better than that with ratio 9∶1.
In order to study the changes of structure and properties of 2014 aluminum alloy after extrusion at different extrusion ratios, extrusion ratios of 9∶1 and 16∶1 were used to extrude 2014 aluminum alloy at 420 ℃ and 1.34 mm/s extrusion speed. The results show that when extrusion ratio is 9∶1, the phenomenon of dynamic recrystallization is not significant, the defects of as-cast structure cannot be eliminated completely, and the grain size is larger; when extrusion ratio is 16∶1, the defects of as-cast structure are mostly eliminated, dynamic recrystallization is obvious, the grain size is fine, the second phase distribution is uniform, the deformation strengthening effect is large, and the specimen has no cracks; the properties of 2014 aluminum alloy with extrusion ratio of 16∶1 are better than that with ratio 9∶1.
引文
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[4] 王涛,尹志民.高强变形铝合金的研究现状和发展趋势[J].稀有金属,2006(2):197-202.
[5] 郭伦文.2014铝合金热压缩变形流变行为研究[D].长沙:中南大学,2014.
[6] TOTIK Y,SADELER R,KAYMAZ I,et al.The effect of homogenization treatment on cold deformation of AA 2014 and AA 6063 alloys[J].Journal of Materials Processing Technology,2004(1):60-64.
[7] TANNER D A,ROBINSON J S.Reducing residual stress in 2014 aluminum alloy die forgings[J].Materials and Design,2008 (7):1489-1496.
[8] 刘文胜,郭伦文,马云柱,等.2014铝合金热变形的显微组织及流变行为[J].中国有色金属学报,2013(8):2091-2092.
[9] 叶升平.2014铝合金轮毂等温锻造研究[D].长沙:中南大学,2014.
[10] 刘静安,刘煜,韩鹏展,等.现代铝合金挤压新材料的发展概况及市场分析[J].轻合金加工技术,2013(3):13-15.
[11] 刘静安.铝合金挤压及其新材料的研发概况与应用前景[J].中国材料进展,2014(6):12-17.
[12] 侯理达.不同挤压比对Mg-Sn系列合金组织与性能的影响[D].哈尔滨:哈尔滨工程大学,2011.
[13] 李炯辉.金属材料金相图谱[M].北京:机械工业出版社,2006.
[14] 李英民,于跃,任玉艳.Mg2Si金属间化合物概述[J].铸造工程,2009(3):28-31.
[15] 张新梅,郝丽华,蒋大鸣,等.Al-Mg-Si合金拉伸断口研究[J].材料工程,1996(5):35-36.