Effects of graphene nanoplates on microstructures and mechanical properties of NSA-TIG welded AZ31 magnesium alloy joints  

石墨烯微片添加对AZ31镁合金纳米颗粒增强活性钨极氩弧焊接头显微组织及力学性能的影响（英文）

作　　者：Tao ZHANG Jun SHEN Lu-qiang Lü Chun-min WANG Jia-xin SANG Dong WU 张涛;沈骏;吕路强;汪春民;桑嘉新;吴冬(重庆大学材料科学与工程学院机械传动国家重点实验室,重庆400044)

机构地区：[1]State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering,Chongqing University, Chongqing 400044, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第6期1285-1293,共9页中国有色金属学报（英文版）

基　　金：Project(51375511) supported by the National Natural Science Foundation of China;Project(cstc2016jcyj A0167) supported by the Research Program of Basic Research and Frontier Technology of Chongqing of China;Project(SF201602) supported by the Science and Technology Project in the Field of Social Development of Shapingba District of Chongqing of China;Project(XJ201608) supported by the Key Industry Technology Innovation Funds of Science and Technology Development Board of Xiangcheng District of Suzhou of China

摘　　要：The effects of graphene nanoplates(GNPs)on the microstructures and mechanical properties of nanoparticlesstrengthening activating tungsten inert gas arc welding(NSA-TIG)welded AZ31magnesium alloy joints were investigated.It wasfound that compared with those of activating TIG(A-TIG),and obvious refinement ofα-Mg grains was achieved and the finestα-Mggrains of fusion zone of NSA-TIG joints were obtained in the welded joints with TiO2+GNPs flux coating.In addition,thepenetrations of joints coated by TiO2+GNPs flux were similar to those coated by the TiO2+SiCp flux.However,the welded jointswith TiO2+GNPs flux coating showed better mechanical properties(i.e.,ultimate tensile strength and microhardness)than those withTiO2+SiCp flux coating.Moreover,the generation of necking only occurred in the welded joints with TiO2+GNPs flux.研究石墨烯微片(GNPs)的添加对AZ31镁合金纳米颗粒增强活性钨极氩弧焊(NSA-TIG)焊接接头显微组织及力学性能的影响。结果表明,与活性化焊接(A-TIG)相比,NSA-TIG接头熔合区的α-Mg晶粒明显细化,且活性剂为TiO_2+GNPs的接头融合区的α-Mg粒径最小。此外,与涂覆TiO_2+SiC_p活性剂的接头相比,涂覆TiO_2+GNPs活性剂接头的熔深并没有明显的变化,但其力学性能(显微硬度和极限拉伸强度)都明显提高。且涂覆GNPs后接头在拉伸时出现了颈缩现象。

关 键 词：graphene nanoplate nanoparticles strengthening activating gas tungsten inert arc welding AZ31 magnesium alloy microstructure mechanical properties 

分 类 号：TG407[金属学及工艺—焊接]