To improve the bond strength of hybrid components when joined by friction welding, specimens with various front end surface geometries were evaluated. Rods made of aluminum AA6082 (AlSi1MgMn/EN AW-6082) and the case-hardening steel 20MnCr5 (AISI 5120) with adapted joining surface geometries were investigated to create both a form-locked and material-bonded joint. Eight different geometries were selected and tested. Subsequently, the joined components were metallographically examined to analyze the bonding and the resulting microstructures. The mechanical properties were tested by means of tensile tests and hardness measurements. Three geometrical variants with different locking types were identified as the most promising for further processing in a forming process chain due to the observed material bond and tensile strengths above 220 MPa. The hardness tests revealed an increase in the steel’s hardness and a softening of the aluminum near the transition area. Apparent intermetallic phases in the joining zone were analyzed by scanning electron microscopy (SEM) and an accumulation of silicon in the joining zone was detected by energy-dispersive X-ray spectroscopy (EDS).
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机译：为了通过摩擦焊接加入时改善混合动力元件的粘合强度，评估具有各种前端表面几何形状的样品。研究了由铝AA6082（ALSI1MGMN / EN AW-6082）和具有适应连接表面几何形状的壳体硬化钢20mncr5（AISI 5120）制成的棒，以产生形状锁定和材料粘合的关节。选择并测试了八种不同的几何形状。随后，连接的组分进行金属化检查以分析键合和所得的微观结构。通过拉伸试验和硬度测量测试机械性能。由于观察到的材料键合和高于220MPa的拉伸强度，鉴定了具有不同锁定类型的三种几何变体作为进一步的进一步加工，以进一步加工。硬度测试显示钢的硬度增加和铝的软化在过渡区域附近。通过扫描电子显微镜（SEM）分析连接区中的表观金属间相，通过能量分散X射线光谱（EDS）检测连接区域中的硅的积累。
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