Y含量对机械振动ZL114A合金组织及力学性能的影响  

Effects of Y Content on Microstructure and Mechanical Properties of Mechanical Vibration ZL114A Alloy

作　　者：朱劲松 芦刚 陈晓 廖青春 廖倚 陈义斯 ZHU Jinsong;LU Gang;CHEN Xiao;LIAO Qingchun;LIAO Yi;CHEN Yisi(National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hang-kong University,Nanchang 330063)

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063

出　　处：《特种铸造及有色合金》2024年第7期971-975,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52265051)。

摘　　要：为了改善ZL114A的力学性能,采用稀土Y对机械振动下ZL114A合金进行变质处理,研究Y含量对其微观组织及力学性能的影响。结果表明,稀土Y能有效细化α-Al枝晶并促进α-Al枝晶由粗大的树枝状向蔷薇状转变,同时使共晶Si呈短棒状且均匀分布。随着Y含量增加,合金的抗拉强度、伸长率及硬度均呈先增后减的趋势。当Y含量为0.6%时,合金的二次枝晶间距最小,为20.4μm,其抗拉强度、伸长率及硬度(HV)值最大,分别为370.92 MPa、6.8%和91.08。当Y含量大于0.6%时,α-Al组织逐渐粗化,稀土相由较小的块状转变为长棒状。In order to improve the mechanical properties of ZL114A,the rare earth Y was added to modify ZL114A alloy under the mechanical vibration,and the influence of Y on microstructure and mechanical properties was investi⁃gated.The results indicate that rare earth Y can effectively refineα-Al dendrites and promote the transformation ofα-Al dendrites from coarse dendritic to rose-like.Moreover,the eutectic silicon exhibits short rods and uniform distri⁃bution.With the increase of Y content,the tensile strength,elongation,and hardness of alloy presents a trend of increasing firstly and then decreasing.The secondary dendrite spacing of alloy reaches the minimum of 20.4μm with 0.6%Y,and the tensile strength,elongation,and hardness values reach the maximum,which are 370.92 MPa,6.8%,and 91.08 HV,respectively.When Y content exceeds 0.6%,α-Al is gradually coarsed,and the rare earth phase is converted from small blocks to long rods.

关 键 词：ZL114A合金 稀土Y 机械振动 微观组织 力学性能 

分 类 号：TG249.3[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]