首页|Hot tensile deformation behaviour and microstructure evolution of Al3La phase reinforced Mg-5Li-3Al-2Zn alloy formed in-situ by La2O3 particle
Hot tensile deformation behaviour and microstructure evolution of Al3La phase reinforced Mg-5Li-3Al-2Zn alloy formed in-situ by La2O3 particle
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NSTL
Elsevier
? 2022 Elsevier Inc.In this study, LAZ532 alloy reinforced with Al3La phase in-situ precipitated by adding La2O3 particle was fabricated by melting casting. The hot tensile deformation behaviour of the composite was investigated at deformation temperatures of 423 K ~ 573 K and strain rates of 8.3 × 10?5 s?1–1.7 × 10?3 s?1. The results indicated that the peak stress and elongation at fracture of the composite gradually decreased and increased respectively, with the deformation temperature increased or the strain rate decreased. In particular, the composite exhibited outstanding quasi-superplasticity with elongation to fracture up to 213% at 573 K and 8.3 × 10?5 s?1. Based on the results of theoretical calculation, the activation energy Q of the composite was 97.8 kJ/mol. In addition, by the observation and analysis of microstructure at different strains, the strain induced the precipitation of pearlite-like Al3La phase in the grains during hot tensile deformation. The deformation behaviour of the composite was a synergetic deformation mechanism dominated by GBS, supplemented by DDRX and intragranular slip, and the intragranular slip was dominated by prismatic and pyramidal I <c+a> slips.
Deformation behaviourHigh temperature tensileLa2O3 particleMg[sbnd]Li composite
Li X.、Le Q.、Hu C.、Wang T.、Bao L.、Wang P.、Zhou X.、Hu W.、Li D.
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Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University
State Key Laboratory of Bayan Obo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare Earths
NSTL
Elsevier
