Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 814, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141199
Keywords
Al?Mg?Si alloy; Precipitates; Texture; Bendability; Fracture
Categories
Funding
- National Natural Science Foundation of China [51871035]
- National Key R&D Program of China [2016YFB0300901, 2016YFB0300800]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51421001]
- 111 project by the Ministry of Education [B16007]
- China Scholarship Council [201806050054]
- Canada Research Chair program (Poole)
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In this study, four model Al?Mg?Si automotive sheet alloys with different Mg and Si contents were prepared and heat treated to the same T4P temper. The influence of Mg and Si content on microstructure, crystallographic texture, tensile behavior, and bendability was investigated. It was found that increased Mg and Si content led to decreased bendability and the fracture mode was predominately transgranular.
In this paper, four model Al?Mg?Si automotive sheet alloys with different Mg and Si contents were prepared and heated treated to the same T4P temper (solution treated and pre-aged for 8 h at 75 ?C and aged for 1 week at room temperature). The influence of the Mg and Si content on microstructure, crystallographic texture, tensile behavior and bendability was investigated. The evolution of microstructure and texture during thermomechanical processing was characterized. It was found that the bendability of sheets in the T4P temper decreases with raising Mg and Si content. The deterioration of bendability can be related to the decreased true fracture strain measured in tension. The fracture mode in the bend tests was found to be predominately transgranular. Crack initiation was observed at ?-Al(FeMn)Si constituent particles and the propagation of cracks proceeded by a combination of shear bands and void growth/coalescence. Finally, the strength of the recrystallization texture increases was observed to increase with increasing Mg and Si contents and it was found that the relationship between crystallographic texture and the plastic anisotropy, e.g. r-value, could be predicted using the viscoplastic self-consistent (VPSC) polycrystal plasticity model.
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