ZL115合金Sb变质效果的热分析研究  

Thermal Analysis of Sb Modification Effect on ZL115 Alloy

作　　者：任嘉康 毛有武[1] 吴树森[1] 张耀华 吴宇涵 吕书林[1] Ren Jiakang;Mao Youwu;Wu Shusen;Zhang Yaohua;Wu Yuhan;Lu Shulin(State Key Laboratary of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology)

机构地区：[1]华中科技大学材料学院,材料成形与模具技术国家重点实验室,武汉430074

出　　处：《特种铸造及有色合金》2022年第3期360-366,共7页Special Casting & Nonferrous Alloys

基　　金：浙江省重点研发计划资助项目(2022C01203)。

摘　　要：利用炉前热分析技术研究了Sb含量及保温时间对ZL115铝合金变质效果的影响。结果表明,加入0.1%~0.3%的Sb能降低合金的共晶生长温度,与变质前差值在3.6~8.3℃之间并与变质效果有良好的对应关系。当Sb加入量为0.3%时变质效果最好,力学性能最佳,铸态抗拉强度及伸长率都有提高,分别达到208 MPa和5.65%。延长熔体的保温时间能使共晶Si在长度上缩短,但保温时间过长,熔体中会生成更多的Mg_(3)Sb_(2)化合物,使合金力学性能降低,最佳保温时间为60~90 min。Sb含量超过0.3%时发生过变质,并在冷速较快时生成Mg_(3)Sb_(2)化合物。The modification effect of ZL115 aluminum alloy with different Sb contents at different holding time was investigated by rapid thermal analysis technology.The results indicate that the growth temperature(T;)of the eutectic silicon is decreased by Sb addition of 0.1%~0.3%,which has 3.6~8.3℃difference before modification,and a good corresponding relationship with the modification effect can be obtained.Desirable modification effect and the optimal mechanical properties of the ZL115 alloy were obtained with addition of 0.3%Sb,where the as-cast tensile strength and elongation are increased,reaching 208 MPa and 5.65%,respectively.The length of the eutectic silicon can be shortened with increasing in the holding time,while the longer holding time leads to the excessive Mg_(3)Sb_(2) intermetallic,reducing the mechanical properties.Therefore,the desirable holding time is 60~90 min.The excessive eutectic silicon modification occurs when the Sb content exceeds 0.3%,and Mg_(3)Sb_(2) is generated under fast cooling rate.

关 键 词：ZL115合金 锑变质 保温时间 热分析 共晶Si 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG115.25[金属学及工艺—金属材料]