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Al-Zn-Mg-Cu계 알루미늄 합금의 열간 균열 특성에 미치는 합금조성의 영향
김지훈 ( Jee Hun Kim ),조재섭 ( Jae Sub Jo ),심우정 ( Woo Jeong Sim ),임항준 ( Hang Joon Im ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.9
Hot tearing was the most significant casting defect when the castability evaluation of the Al- Zn-Mg-Cu alloy system was conducted. It was related to the solidification range of the alloy. Therefore, the hot tear susceptibility of the AA7075 alloy, whose solidification range is the widest, was evaluated. The hot tear susceptibility was evaluated by using a mold for a hot tearing test designed to create the condition for the occurrence of hot tear in 8 steps. According to the tearing location and shape, a hot tear susceptibility index (HTS) score was measured. The solidification range of each alloy and hot tear susceptibility was compared and thereafter the microstructure of a near tear defect was observed. As a result, the HTS of the AA7075 alloy was found to be 67. Also, the HTS in relation to a change in Zn, Mg, Cu composition showed a difference of about 6-11% compared to the AA7075 alloy.
전기자동차 알루미늄 이종소재의 하이브리드 Clinching 접합특성에 따른 기계적 특성
정진욱(Jin-Uk Jung),김성재(Seong-Jae Kim),이선빈(Sun-Bin Lee),심우정(Woo-Jeong Sim),김병규(Byeong-Gyu Kim) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.1
Recently, in the automobile industry, the development of technology that can satisfy environmental regulations and fuel economy reduction requirements due to vehicle weight is an important topic. To solve this issue, vehicle-body weight reduction technology is a promising solution. To reduce the vehicle weight, automobiles with a large amount of aluminum use general wire welding (MIG, TIG) to bond aluminum components to each other. However, for complex three-dimensional shapes and dissimilar materials, traditional welding methods of inducing metal bonding and joining access are difficult to implement. Therefore, in such cases, joining techniques should be used. In this study, the mechanical properties of clinching joints without rivets are studied among various mechanical joint methods for weight reduction.