High strength and ductility Mg-8Gd-3Y-0.5Zr alloy with bimodal structure and nano-precipitates
Journal of Materials Science & Technology(2020)
摘要
To resolve the strength-ductility trade-off problem for high-strength Mg alloys, we prepared a high performance Mg-8Gd-3Y-0.5 Zr (wt%) alloy with yield strength of 371 MPa, ultimate tensile strength of 419 MPa and elongation of 15.8%. The processing route involves extrusion, pre-deformation and aging, which leads to a bimodal structure and nano-precipitates. Back-stress originated from the deformation-incompatibility in the bimodal-structure alloy can improve ductility. In addition, dislocation density in coarse grains increased during the pre-deformation strain of 2%, and the dislocations in coarse grains can promote the formation of chain-like nano-precipitates during aging treatment. The chain-like nano-precipitates can act as barriers for dislocations slip and the existing mobile dislocations enable good ductility.
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关键词
Magnesium alloy,Strength-ductility trade-off,Bimodal structure,Back-stress,Chain-like intragranular nano-precipitates
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