| 双级均匀化对7055铝合金微结构与力学性能的影响 |
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| 引用本文： | 张蓉,林高用,伍利群.双级均匀化对7055铝合金微结构与力学性能的影响[J].武汉理工大学学报,2011(7). |
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| 作者姓名： | 张蓉 林高用 伍利群 |
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| 作者单位： | 湖南工学院机械工程系;中南大学材料科学与工程学院; |
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| 基金项目： | 湖南省自然科学基金(09JJ6082); 湖南省教育厅一般项目(08C258) |
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| 摘 要： | 采用光学显微镜、透射电镜观察、硬度及单向拉伸测试,研究了双级均匀化制度对7055合金微结构与性能的影响。结果表明:与单级均匀化相比,双级均匀化处理的初级低温保温过程有利于原始晶界附近低Zr区域的Al3Zr弥散析出;双级均匀化处理后无沉淀析出带(PFZ)变窄,晶界附近Al3Zr粒子密度增加;弥散分布的Al3Zr粒子通过钉扎晶界与拖曳位错,有效地抑制了再结晶,以至于经热轧固溶后再结晶百分数降低40%左右;保留下来的大量位错和未再结晶组织,提高了合金T6态力学性能。
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| 关 键 词： | 均匀化热处理 Al3Zr 再结晶 微结构 |
Effect of Two-stage Homogenization on the Microstructure and Mechanical Properties of a 7055 Aluminum Alloy |
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| ZHANG Rong ,LIN Gao-yong,WU Li-qun.Effect of Two-stage Homogenization on the Microstructure and Mechanical Properties of a 7055 Aluminum Alloy[J].Journal of Wuhan University of Technology,2011(7). |
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| Authors: | ZHANG Rong LIN Gao-yong WU Li-qun |
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| Affiliation: | ZHANG Rong 1,2,LIN Gao-yong2,WU Li-qun1(1.Department of Mechanical Engineering,Hunan Institute of Technology,Hengyang 421008,China,2.School of Materials Science and Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | The effect of homogenization on the microstructure and properties of a 7055 alloy was investigated by optical microscopy,transmission electron microscopy,Vickers hardness test and uniaxial tensile test.It is found that the initial low-temperature preheating for the two-stage homogenization,comparing with the single-stage homogenization,can achieve a higher density of Al3Zr particles,and a narrower precipitating free zone(PFZ).It is suggested from microstructural analysis that the dispersion distribution of ... |
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| Keywords: | homogenization Al3Zr recrystallization microstructure |
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