问题描述：
英语翻译
镁合金是目前实际应用中最轻的金属结构材料,具有比重小、比强度、比刚度高、导热导电性好、阻尼性、切削加工性好等优点.近年来人们相继开发了Mg-Y-Nd-Zr和Mg-Gd-Y-Zr等新型的高强耐热镁合金.本研究主要针对Mg-Gd-Y-Zr合金的组织性能及热处理对其的影响得到如下主要结论：1）铸态合金的显微组织由镁基固溶体和铸造第二相组成,析出相主要沿晶界形成不连续的条网状共晶组织,而晶内含量较少.晶粒呈菊花状,尺寸约为50μm.2）受非平衡凝固作用,合金中Y和Gd固溶度较大,在合金内趋于均匀分布,第二相主要为的Mg 24 Y5、Mg12ZnY和Mg 5 Gd,具有点状、针状和条块状等不同形态.3）经T6处理后的合金,晶粒由菊花状向球状转化,晶粒尺寸略有长大,而析出相的形态、尺寸、分布和数量均发生明显变化.4）Gd元素的少量添加使基体合金的强度和塑性均得到提高在T6处理后合金的硬度提高不明显甚至出现比初始态的硬度略低的现象,最优固溶条件为530℃4h.合金的最优时效温度为225℃,达到峰值时效的时间为12h.
问题解答：
我来补答
Magnesium alloy is the practical application of the lightest metal structural material,with a small specific gravity,then strength,thermal conductivity than high stiffness,good,damping sex,cutting the advantages of nature.In recent years,people have developed the Mg-Y-Nd-Zr land Mg-Gd-Y-Zr,new type of high strength heat-resistant magnesium alloy.This research mainly in Mg-Gd-Y-Zr alloy organization performance and heat treatment influence on the main conclusions are as follows to get:1) as-cast microstructure of magnesium alloy for the second phase composition interstitial and casting,separation in the form of grain boundaries main discontinuous article eutectic network organization,and JingNa content is less.Grain is chrysanthemum shape,size of about 50 μ m.2) by non-equilibrium crystallizing role,in the alloy Y and Gd solid solution for larger,tend to be evenly distributed within the alloy,mainly for the second phase of Mg 24 Y5,Mg12ZnY and Mg 5 Gd,have point-blank,needle and TiaoKuaiZhuang and so on the different forms.3) the T6 process after the alloy,grain shape by chrysanthemum to the globular transformation,grain size grew up slightly,and the separation phase,the shape of the size,distribution and quantity is changing greatly.4) Gd the small amount of matrix elements add to the strength of the alloy and plastic are improved in the treatment of hardness alloy after introducing T6 improve not obvious appear even more than the hardness of initial state of less phenomenon,the optimal solid solution conditions for 530 ℃ 4 h.The optimal time of alloy temperature of 225 ℃,peak time time for 12 h.
