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本文研究了不同Y含量对Ng—Zn—Zr合金显微组织的影响,并对析出相进行了鉴定,探讨了析出相析出过程及对合金力学性能的影响。研究结果表明,Y含量变化能使合金晶界状况发生变化,当Y含量小于0.94％wt时,可使合金晶界窄化,当Y含量大于0.94％wt后,反而使晶界重新粗化,在三角或四角晶界处出现共晶组织;当Y含量大于0.94％wt时,Y趋向晶界富集,并与在晶界富集的Zn形成颗粒较大的Y—Zn相,对合金力学性能产生不利影响;在该合金中,适当的Y含量(约0.94％wt)可提高合金挤压态下的抗拉强度,其强化机理主要是由于Y能使晶界窄化,金相组织均匀,并能使Y与Mg形成弥散强化相,使晶内产生亚晶等原因所致。
In this paper, the effect of different Y content on the microstructure of Ng-Zn-Zr alloy was studied. The precipitated phase was identified and the precipitation process and the effect on the mechanical properties of the alloy were discussed. The results show that the grain boundary of the alloy can be changed by the change of Y content. When the Y content is less than 0.94% wt, the grain boundary can be narrowed. When the Y content is more than 0.94% wt, When the content of Y is more than 0.94% wt, Y tends to be enriched in the grain boundary and forms a larger Y-Zn phase with the Zn enriched in the grain boundary, In the alloy, proper Y content (about 0.94% wt) can increase the tensile strength of the alloy under the extrusion condition. The strengthening mechanism is mainly due to Y can make the grain boundary narrow, the microstructure is uniform , And can make Y and Mg form a dispersion strengthening phase, resulting in subgrain crystal and other causes.