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来源：百度知道 编辑：UC知道 时间：2024/05/25 17:40:52
本文设计实验通过将不同Zn含量加入5056铝合金中，测定不同的Zn含量对合金组织与性能的影响。探究Al-Mg-Zn合金中Zn元素含量对合金力学性能和组织的影响，通过镜像分析和性能测试，寻求最佳的成份配比。
参阅有关文献知：A1一Mg—Zn合金中的Mg和Zn含量对合金的性能影响很大。当Mg含量小于3.5％时，合金不能获得较高的强度，而当Mg含量大于8.0％时，合金在熔炼过程中易氧化，并产生疏松、气孔等铸造缺陷。合金中Zn含量大于Mg含量时，易形成很大的内应力，促进晶间应力腐蚀，因而易产生晶间裂纹而导致断裂隐患J．从热处理方面考虑，Zn和Mg含量的总量不能大于12％，否则会对热处理产生有害的影响。
本文通过添加从2%到5.5%不同含量的Zn至5056铝合金中，熔炼后对其铸态条件下进行硬度试验，然后进行固溶+时效处理后，在进行显微组织观察和硬度试验，从而探究出Zn在铝镁合金中最佳的成分配比，保证Al—Mg—Zn合金具有较高综合性能。

This paper design the experiment ,which measure the impact of the different Zn content and performance by adding different Zn content into 5056 aluminium alloy.Research the impact of Zn element content in Al-Mg-Zn alloy on performance and organization of alloy mechanics, from mirror analysis and performance testing to find the best composition matching.
Refer to some literature:Mg and Zn content in A1一Mg—Zn make great impact on alloy's performance.When the Mg content less than 3.5%, alloy is difficult to get the high strength ,then the Mg content is more than 8.0%, alloy is easy be oxidized during smelting,and with some casting defect,such as porous. Under the conditons that Zn content is more than Mg content, which will form the internal stress and promote the stress corrosion between crystals,then form crack between crystals easily and cause the hidden danger. To consider from the heat treatment, the total content of Zn and Mg can not be more than 12%, or will make a