超声熔体处理对ZA27合金组织和力学性能的影响  

Effects of Ultrasonic Melt Treatment on Solidification Structure and Mechanical Properties of ZA27Alloy

作　　者：张黎 陈乐平[1] 周全[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2018年第1期78-81,共4页Special Casting & Nonferrous Alloys

基　　金：江西省教育厅科技重点资助项目(GJJ1606796)

摘　　要：研究了不同超声功率(0~900 W)和作用时间(0~90s)对ZA27合金组织和力学性能的影响。结果发现,在520℃熔体保温条件下,随着超声功率或超声作用时间的增加,合金的初生相均先细化后粗化。当超声功率为700 W,处理时间为30s时,合金初生相的细化效果最佳,综合力学性能最好,其抗拉强度和伸长率分别为435.16 MPa和6.11%。断口分析可知,超声熔体处理后ZA27合金断口具有较多的韧窝和撕裂棱,具有脆性断裂和韧性断裂的混合断裂特征。The influences of different ultrasonic power （0~900 W） and treating time （0~90 s） on the solidified structure and mechanical properties of ZA27 alloy were investigated. The results indicate that with the increase of ultrasonic power or treating time, the primary phase in the alloy is refined at first and then coarsened at 520℃, and primary phase exhibits desirable with 700 W for 30 s.When the ultrasonic power is 700 W for 30 s, the alloy presents the satisfied comprehensive mechanical properties, where the tensile strength and elongation reach 435.16 MPa and 6.11%. By observing fracture morphology of alloy, it is found that after ultrasonic melt-treatment, the tensile fracture of ZA27 alloy is characterized by brittle fracture in combination with toughness fracture,and many tearing slits and dimples can be observed at the fracture surface.

关 键 词：ZA27合金 超声熔体处理 凝固组织 力学性能 

分 类 号：TG146.13[一般工业技术—材料科学与工程] TP559[金属学及工艺—金属材料]