第42卷第4期 Vol.42No.4
假压技木
FORGING &STAMPING TECHNOLOGY
Zn含量对7XXX铝合金性能及微观组织影响
唐仁奎
（重庆科创职业学院信息与机电工程学院，重庆402160）
2017年4月 Apr.2017
摘要：为了深入研究7XXX铝合金的成分对材料性能的影响，对通过模铸工艺制备的高锌含量的铝基合金性能和微观组织进行了研究，重点探讨了Zn含量对合金组织、性能和铸造流动性的影响。研究结果表明，当Zn含量从20%增加到40%时：对材料组织的影响主要表现为品粒尺寸由45μm减小到20μm，品界处非平衡相a+m的体积分数由9%增加到28%；对力学性能的影响表现为抗拉强度与届服强度升高，分别达到470MPa和430MPa，伸长率有所降低，从7%降低至3%左右，合金硬度值由75HV提高至140HV。同时，Zn含量的增加可以降低合金固相线温度，这有利于提高合金的流动性。
关键词：7XXX铝合金：模铸；微观组织：Zn含量；流动性 DOI: 10. 13330/j. issn. 1000-3940. 2017. 04. 032
中图分类号：TG113
文献标识码：A
文章编号：1000-3940（2017）04-0184-04
Influenceof Zn contents onproperties and microstructureof aluminumalloy7XXX
Tang Renkui
( School of Information and Electrical Engineering, Chongqing Creation Vocational College, Chongqing 402160, China)
Abstract: In order to further study the influence of composition of aluminum alloy 7XXX on material performance, the performance and microstructure of Al based alloys with high content of Zn produced by mold casting were researched, and the influence of Zn content on the microstructure, mechanical properties and casting fluidity were studied. The results show that when the content of Zn increases from 20% to 40% , the influences on microstructure are that the average grain size decreases from 45 μm to about 20 μm, and the non equilibrium phase ca + n) volume fraction at the grain boundary increases from 9% to 28% , Moreover, the influences on mechanical prop erties are that the tensile strength and yield strength increase to 470 MPa and 430 MPa respectively, the elongation decreases from 7% to 3% , and the alloy hardness value improves from 75 HV up to 140 HV. At the same time, the increase of Zn content can reduce the soli-dus temperature of alloy, and the fluidity of alloy is improved.
Key words: aluminum alloy 7XXX; mold casting: microstructure; Zn oontent ; fluidity
Al-Zn合金具有密度低、强度高、耐腐蚀性能好以及良好的导电导热性能等一系列的优点，收稿日期：20161122；修订日期：2017-0210
作者简介：唐仁奎（1974－），男，硕士，讲师 E-mail:tangrk1@163.com
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万方数据
逐渐成为国内外学者研究的热点。其中，7XXX铝合金是典型的含Z铝基合金，广泛应用于航空航天高强结构件的制造[1-4]。对于该系列铝合金性能的研究也比较广泛，如已有科研工作者采用不同的时效强化处理来有效提高材料强度，或者研究不同工艺对材料性能的影响，但是由于7XXX铝合金较低
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