喷射沉积SiC_p/Al-Fe-V-Si板坯的楔形压制与组织演变  

Wedge Pressing and Microstructure Evolution of Spray Deposited SiC_p/Al-Fe-V-Si Sheet

作　　者：徐政坤[1] 贺毅强[2,3] 钱晨晨 

机构地区：[1]张家界航空工业职业技术学院 [2]江苏省海洋资源开发研究院 [3]淮海工学院机械工程学院

出　　处：《特种铸造及有色合金》2017年第11期1242-1244,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51004050);江苏省自然科学基金资助项目(BK20141250);连云港市科技计划项目(CG1418;CXY1404)

摘　　要：采用多层喷射沉积技术制备了SiC_p/Al-8.5Fe-1.3V-1.7Si复合材料板坯,再通过多道次楔形压制制备了复合材料板材。介绍了楔形压制喷射沉积铝基复合材料的压制设备、成形原理与过程;研究了板坯在楔形压制过程中孔洞、SiC_p分布、弥散粒子和SiC-Al界面的演变。结果表明,楔形压制工艺能有效致密喷射沉积板坯,当压下量为50%时,沉积颗粒边界消除,相对密度达97.6%,且能使SiC_p分布均匀,但因剪切作用小,弥散分布的微型孔洞未能完全消除;板坯在480℃下多道次楔形压制,弥散粒子依然保持在60~100nm,未见明显长大,且未向Al13Fe4等平衡相转变,SiC-Al界面干净,纳米过渡层可以提高界面润湿性。SiCp/Al-8.5 Fe-1.3 V-1.7 Si composites prepared by multi-layer spraying deposition were densified by multi-pass wedge pressing.Equipment,forming principle and procedure of wedge pressing of spraying deposited Al-matrix composite were introduced.Evolution of pore,SiCpdistribution,secondphase dispersoids and SiC/Al interface of composite plate during wedge pressing were observed.The results reveal that the composite blank can be densified by wedge pressing,and boundaries at deposited particles are eliminated by wedge pressing with 50% in reduction,and relative density of the pressed composites reaches up to 97.6% with homogeneous SiC particle distribution.However,the dispersed pores are difficult to be eliminated by wedge pressing because of its low shearing forces.Dispersoids still keep with 60~100 nm in diameter from growing obviously and transforming into equilibrium phase such as Al13 Fe4 during the wedge pressing at 480℃.SiC/Al interface of the composite plate as-wedge pressed exhibits clean,which is contributed to the wettability between SiCpand Al matrix.

关 键 词：喷射沉积 耐热铝合金 复合材料 楔形压制 显微组织演变 

分 类 号：TB331[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属压力加工]