Al-Ti-C-O的制备及其对AZ31镁合金的晶粒细化作用  

Preparation of Al-Ti-C-O and Its Effects on Grain Refinement of AZ31 Magnesium Alloy

作　　者：李广阳 白玉 范文学 郝海[1,2] Li Guangyang;Bai Yu;Fan Wenxue;Hao Hai(Key Laboratory of Solidification Control and Digital Preparation Technology in Liaoning Province,School of Materials Science and Engineering,Dalian University of Technology;Ningbo Research Institute of Dalian University of Technology)

机构地区：[1]大连理工大学材料科学与工程学院,凝固控制与数字化制备技术辽宁省重点实验室,辽宁大连116024 [2]大连理工大学宁波研究院

出　　处：《特种铸造及有色合金》2022年第12期1540-1547,共8页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2018YFA0702903);国家自然科学基金资助项目(52171030)

摘　　要：利用前驱体工艺结合熔体反应法制备出一种含Al_(2)O_(3)、Al_(4)C_(3)、TiAl_(3)等多种颗粒相的Al-Ti-C-O中间合金细化剂,最佳工艺参数为850℃×2 h,并初步探究了反应机理。在730℃下加入1%的Al-6TiO_(2)-3C中间合金,可以使AZ31镁合金的晶粒尺寸从375μm细化至86μm,抗拉强度从118.4 MPa提升至199.7 MPa,伸长率从13.3%提升至25.2%,分别提高了68.7%和89.5%。采用OM、SEM、XRD等表征手段分析了Al_(2)O_(3)、MgAl_(2)O_(4)、TiAl_(3)、Al_(4)C_(3)等颗粒相在AZ31镁合金中的细化及强化机理。An Al-Ti-C-O intermediate alloy refiner containing various particle phases such as Al_(2)O_(3),Al_(4)C_(3)and TiAl_(3)was prepared using the precursor process route combined with the melt reaction method at 850℃for 2 h,and the reaction mechanism was analyzed.The addition of 1%Al-6 TiO_(2)-3 C intermediate alloy at 730℃can refine the grain size of AZ31 magnesium alloy from 375μm to 86μm,and increase the tensile strength from 118.4 MPa to 199.7 MPa and elongation from 13.3%to 25.2%,increased by 68.7%and 89.5%,respectively.The refinement and strengthening mechanism of the particulate phases such as Al_(2)O_(3),MgAl_(2)O_(4),TiAl_(3)and Al_(4)C_(3)in AZ31 magnesium alloy were analyzed using OM,SEM,XRD and other characterization means.

关 键 词：晶粒细化 AZ31镁合金 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]