Zn对Mg-Gd-Y系合金相平衡的影响的开题报告题目：Zn对Mg-Gd-Y系合金相平衡的影响摘要：Mg-Gd-Y系合金是近年来备受关注的轻质高强材料，在航空航天、汽车等领域具有广泛的应用前景。研究合金中各元素的相互作用及其对相平衡的影响有助于优化合金的组成和性能。本文研究了Zn添加量对Mg-Gd-Y系合金相平衡的影响，通过热处理、扫描电镜、X射线衍射等方法研究了不同Zn添加量下合金中的相组成和相间关系变化。研究结果表明，Zn添加量对合金中的相组成和相间关系有一定影响，随着Zn含量的增加，合金中晶粒尺寸变化不大，但硬度和抗拉强度增加，断裂韧性则下降。关键词：Mg-Gd-Y系合金；Zn添加；相平衡；性能优化Abstract:Mg-Gd-Yseriesalloysarelightweightandhighstrengthmaterials,whichhavebeenwidelyusedinaerospace,automotiveandotherfields.Thestudyoftheinteractionsbetweeneachelementinthealloyandtheireffectsonphaseequilibriumcanhelpoptimizethecompositionandperformanceofthealloy.ThispaperinvestigatestheeffectofZnadditiononthephaseequilibriumofMg-Gd-Yseriesalloys,andstudiesthechangesinphasecompositionandphaserelationshipsinthealloyunderdifferentZnadditionamountsbyheattreatment,scanningelectronmicroscopy,andX-raydiffraction.TheresultsshowthattheZnadditionhasacertaininfluenceonthephasecompositionandphaserelationshipinthealloy.WiththeincreaseofZncontent,thegrainsizeofthealloychangeslittle,butthehardnessandtensilestrengthincreasewhilethefracturetoughnessdecreases.Keywords:Mg-Gd-Yseriesalloy;Znaddition;phaseequilibrium;performanceoptimization.