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采用光学显微镜、X射线衍射、压缩及硬度试验,研究不同Zn含量对Mg98-x Er2Znx合金铸态组织和力学性能的影响。实验结果表明,当x=0,0.5和1.0时,3种合金铸态组织都呈现典型的树枝晶结构。随着Zn含量从0增加到1.0%(原子比)时,合金晶粒也随之逐步细化,二次枝晶臂的间距减小;当Zn含量从1.0%增加到1.5%时,合金却呈现出典型的球状枝晶结构,晶粒粗化。Zn元素含量从0.5%增加到1.5%时,合金中的相组成没有发生变化,依然由α-Mg相,X-Mg12ZnEr相和(Mg,Zn)x Er相组成。随着Zn含量的增加,合金的力学性能呈现出先升高后降低的趋势;当Zn含量为1.0%时,合金的力学性能最好。
The effects of Zn content on the as-cast microstructure and mechanical properties of Mg98-x Er2Znx alloy were investigated by optical microscope, X-ray diffraction, compression and hardness test. The experimental results show that when x = 0, 0.5 and 1.0, the as-cast dendritic structures of the three alloys all show typical dendrite structure. With the increase of Zn content from 0 to 1.0% (atomic ratio), the grain size of the alloy gradually refined and the spacing of the secondary dendrite arms decreased. When the Zn content increased from 1.0% to 1.5%, the alloy A typical spherical dendritic structure appears, the grain coarsening. When the content of Zn element increases from 0.5% to 1.5%, the phase composition of the alloy does not change, and is still composed of α-Mg phase, X-Mg12ZnEr phase and (Mg, Zn) x Er phase. With the increase of Zn content, the mechanical properties of the alloy tend to increase firstly and then decrease. When the Zn content is 1.0%, the mechanical properties of the alloy are the best.