Zr质量分数对7085铝合金组织和性能各向异性的影响

Effects of Zr content on microstructure properties of anisotropy of 7085 aluminum alloy

通过室温拉伸试验、腐蚀性能测试和光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等研究Zr质量分数对7085铝合金组织和性能各向异性的影响。研究结果表明:合金的强度随着Zr质量分数增加先增加再减小,Zr质量分数为0.12%时合金的强度出现峰值;添加Zr抑制合金再结晶,提高其强度和抗剥落腐蚀性能;挤压方向(L-T)力学性能均优于横向(T-L),Zr质量分数为0.12%时、各向异性最小;横截面的抗腐蚀性能优于长截面,Zr质量分数为0.14%时,抗腐蚀性能最佳且各向异性最小;合金的性能各向异性随Zr质量分数增加而先减小再后增大。Zr质量分数最佳添加范围为0.12%~0.14%,能保持高强度耐腐蚀性能并具有较低的各向异性。

The influence of the content of Zr on the anisotropy of 7085 alloy was studied by room temperature tensile test, corrosion test and optical microscopy（OM）, scanning electron microscopy（SEM）, and transmission electron microscopy（TEM）. The results show that the strength of the alloy with the increase of Zr mass fraction first increases and then decreases. When Zr content is 0.12%（mass fraction）, the strength of the alloy in peak, The addition of Zr inhibits the recrystallization of the alloy and improves its strength and exfoliation corrosion resistance. The mechanics properties of the extruding direction（L-T） is better than that of transverse（T-L）. When Zr mass fraction is 0.12%, the alloy has minimum anisotropy. The corrosion resistance of cross section is superior to the long section. When Zr mass fraction is 0.14%, the alloy has the best corrosion resistance and minimum anisotropy. The anisotropic properties of the alloy with the increase of Zr mass fraction first increases and then decreases. The optimal Zr content is in the range of 0.12%-0.14%, which can maintain high strength and corrosion resistance and has low anisotropy.