| 时效处理对7050T451合金组织及性能的影响 |
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| 引用本文： | 李红,曾元松.时效处理对7050T451合金组织及性能的影响[J].塑性工程学报,2013,20(2):116-121. |
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| 作者姓名： | 李红 曾元松 |
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| 作者单位： | 北京航空制造工程研究所,北京,100024 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 采用室温拉伸和断裂韧性测试方法,借助扫描电镜、透射电镜等设备,研究时效处理对7050T451铝合金性能的影响及材料微观组织形貌演变。结果表明,160℃时效时,随着时效时间的增加,晶界析出的粗大η相增多,晶界无析出带变宽,7050T451铝合金晶粒内部弥散分布的细小η′相密度增加,成为主要强化相,材料强度提高,延伸率下降;7050T451晶界析出相体积分数随时效时间增加,降低材料断裂韧性;晶粒内残留位错处易析出粗大η相,但数量较少,对材料性能无明显影响。
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| 关 键 词： | 7050铝合金 时效 显微组织 力学性能 |
Effects of aging treatment on microstructure and properties of 7055T451 aluminum alloys |
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| LI Hong
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ZENG Yuan-song.Effects of aging treatment on microstructure and properties of 7055T451 aluminum alloys[J].Journal of Plasticity Engineering,2013,20(2):116-121. |
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| Authors: | LI Hong ZENG Yuan-song |
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| Abstract: | The effects of aging treatment on mechanical properties and microstructure evolution of 7055T451 aluminum alloy were investigated by fracture toughness test,TEM and SEM observation.The results showed that more precipitates at grain boundary and wider precipitate-free grain boundary were observed.Higher strength and less extensibility were resulted due to the dispersion-strengthening of η′ phase during aging at 160℃.The volume fraction of grain boundary precipitate increased with increase of aging time,which resulted in the decrease of fracture toughness.A small amount of coarser η phase tended to precipitate at residual dislocation and had no effect on mechanical properties. |
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| Keywords: | 7055 aluminum alloy aging treatment microstructure mechanical properties |
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