CAJ | 학술논문

对3 mm厚的1060工业纯铝和退火纯铜异种金属搅拌摩擦焊进行研究。在搅拌头旋转速度为1050 r/min、焊接速度为30 mm/min时，获得性能良好的铝/铜接头。交替片层结构主要分布于焊核区顶部与铜/焊核区交界附近，促进了铝、铜两种材料的界面扩散及铝和铜之间的冶金键合。然而，界面腐蚀形貌揭示界面内部的弱连接机制，导致拉伸试验中裂纹沿界面区域萌生和扩展，断裂方式为韧?脆混合型断裂。接头的抗拉强度为148 MPa，高于工业纯铝母材的抗拉强度。搅拌摩擦焊强烈塑性变形引起的晶体缺陷和晶粒细化加速原子间的短程扩散，从而促进金属间化合物Al4Cu9和Al2Cu的生成。XRD结果显示，金属间化合物Al4Cu9主要位于铜/焊核区过渡区域。焊核区较高的位错密度和位错环的形成是导致该区域硬度明显升高的主要原因。
대3 mm후적1060공업순려화퇴화순동이충금속교반마찰한진행연구。재교반두선전속도위1050 r/min、한접속도위30 mm/min시，획득성능량호적려/동접두。교체편층결구주요분포우한핵구정부여동/한핵구교계부근，촉진료려、동량충재료적계면확산급려화동지간적야금건합。연이，계면부식형모게시계면내부적약련접궤제，도치랍신시험중렬문연계면구역맹생화확전，단렬방식위인?취혼합형단렬。접두적항랍강도위148 MPa，고우공업순려모재적항랍강도。교반마찰한강렬소성변형인기적정체결함화정립세화가속원자간적단정확산，종이촉진금속간화합물Al4Cu9화Al2Cu적생성。XRD결과현시，금속간화합물Al4Cu9주요위우동/한핵구과도구역。한핵구교고적위착밀도화위착배적형성시도치해구역경도명현승고적주요원인。
Dissimilar friction stir welding between 1060 aluminum alloy and annealed pure copper sheet with a thickness of 3 mm was investigated. Sound weld was obtained at a rotational speed of 1050 r/min and a welding speed of 30 mm/min. Intercalation structure formed at the crown and Cu/weld nugget (WN) area promotes interfacial diffusion and metallurgical bonding of aluminum and copper. However, corrosion morphology reveals the weak bonding mechanism of internal interface, which causes the joint failing across the interface with a brittle?ductile mixed fracture mode. The tensile strength of the joint is 148 MPa, which is higher than that of the aluminum matrix. Crystal defects and grain refinement by severely plastic deformation during friction stir welding facilitate short circuit diffusion and thus accelerate the formation of Al4Cu9 and Al2Cu intermetallic compounds (IMCs). XRD results show that Al4Cu9 is mainly in Cu/WN transition zone. The high dislocation density and formation of dislocation loops are the major reasons of hardness increase in the WN.