| Autor: |
Li, Zhijian, Nie, Huihui, Kong, Qingwei, Chen, Hongsheng, Liang, Wei, Zheng, Liuwei |
| Předmět: |
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| Zdroj: |
Journal of Materials Engineering & Performance; Dec2024, Vol. 33 Issue 23, p13492-13501, 10p |
| Abstrakt: |
Tensile twins (TTs) were induced in AZ31 Mg rolled sheet and then, the pre-twinned sample (C25) was annealed at 200 °C for 6 h (A200) to retain TTs and 450 °C for 2 h (A450) to eliminate TTs to the full extent, respectively, to explore the effect of recrystallization of pre-twinned Mg sheets on microstructure and mechanical properties. Abundant TTs with a volume fraction of 67.9% are induced in C25, and work hardening and grain refinement strengthening result in its highest ultimate tensile strength of 300 MPa, and its lowest elongation ~ 9% indicates that induced TTs contribute little to deformation coordination. Strong rolling direction (RD)-titled texture is mainly responsible for the distinct difference in its yielding strengths along the RD and transvers direction. Static recrystallization occurs both in A200 and A450. A200 shows excellent ductility (~ 18% elongation) owing to a bimodal distribution with weakened RD-titled texture and its smallest average grain size of 8.02 μm. The vast majority of TTs retains and some "isolated" TT laminae detaching from grain boundaries of their parent grains are observed in A200, but TTs are hardly observed in A450 accompanying some thick TT laminae with grain-like morphology. The recrystallized grains inheriting the orientation of TTs and amalgamation and growth of subgrains strengthen the RD-titled texture and cause increase in fraction of high angle grain boundaries, leading to a slight decrease in strength. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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