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Tensile tests of rolled sheets of a 5083 Al alloy were conducted between -196°C and 200°C and microfractographic observations were made on an electron microscopy.(1) A yield phenomenon occurred except at 200°C. Further, serrated flows were prominent at room temperature and 100°C.(2) Elongation to fracture was minimum at 100°C. At -196°C, uniform elongation contributed to the total elongation, while at 200°C local elongation mainly contributed to it.(3) From a high notch yield ratio and a small notch tensile ratio at -196°C, it was inferred that the 5083 alloy was sensitive to the stress concentration and tended to retard the crack propagation or the void growth after yielding.(4) Although dimple patterns were observed on the fracture surfaces of specimens tested at every tempera- ture, laminated cracks were also present at -196°C. The depth of the dimples was 5 to 20μ and became smaller at -196°C.(5) There were cleaved inclusions at the bottom of the dimples. Multiple cleavage fracture of inclusions was observed at -196°C.(6) EPMA analyses showed that the inclusions at the dimple bottoms were mainly Al-Fe-Mn compounds while most inclusions at the dimple edges were Mg-Si compounds.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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