Zr+Er及Zr+Y对Al-Mg-Si-Cu-Mn-Cr合金组织和性能的影响
首发时间:2017-05-12
摘要:(采用光学显微镜(OM)、电子显微镜(SEM)、能谱分析仪(EDS)、透射电子显微镜(TEM)和拉伸强度试验研究了0.3%Zr(质量分数)+0.2%Er(质量分数)和0.3Zr(质量分数)+0.2%Y(质量分数)两种组合元素对Al-0.6Mg-0.9Si-0.5Cu-0.5Mn-0.2Cr合金热处理前后微观组织和力学性能的影响。结果表明:两种组合元素的加入,均能细化铸态晶粒,其中Zr+Y改性合金的晶粒细化更明显,且两种改性铸态合金的强度和塑性均较基体合金提高。在热处理过程中,两种组合元素会影响基体中弥散相的析出,降低合金的弥散强化效果。最终Zr+Er改性合金的强度相较于基体合金提高,而Zr+Y改性合金的强度则相较基体降低,两种合金的塑性均较基体降低。
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Effects of Zr+Er and Zr+Y on the Microstructures and Tensile Properties of Al-Mg-Si-Cu-Mn-Cr Alloys
Abstract:The effects of 0.3wt.%Zr+0.2wt.%Er and 0.3wt.%Zr+0.2wt.%Y on the microstructures and mechanical properties of Al-0.6Mg-0.9Si-0.5Cu-0.5Mn-0.2Cr alloy (all in wt. %) before and after heat treatment were investigated in this paper based on optical microscopy (OM), scanning electron microscopy (SEM), Transmission Electron Microscope (TEM) and properties testing. The results showed that both Zr+Er and Zr+Y could refine the α-Al grains, and the latter was more prominent and effective. Furthermore, both of them improved the strength and ductility of as cast Al-0.6Mg-0.9Si-0.5Cu-0.5Mn-0.2Cr alloy (all in wt. %). With heat treatment both Zr+Er and Zr+Y had a negative influence on the precipitation of dispersed phase in the based alloy and resulted in an decreaEffects of Zr+Er and Zr+Y on the Microstructures and Tensile Properties of Al-Mg-Si-Cu-Mn-Cr Alloysse in dispersion strengthening. Finally, Zr+Er modified alloy had higher strength than based alloy, while Zr+Y modified alloy had lower strength, and both of them had lower elongation than based alloy.
Keywords: Aluminium alloy Microalloying Grain refinement Dispersed phase Mechanical property
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No.4732747808003149****
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