首页|Microstructure and impact behavior of Mg-4Al-5RE-xGd cast magnesium alloys

Microstructure and impact behavior of Mg-4Al-5RE-xGd cast magnesium alloys

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This work investigated the microstructure and impact behavior of Mg-4Al-5RE-xGd(RE represents La-Ce mischmetal;x=0％,0.2％,0.7％in mass fraction)alloys cast by high-pressure die casting(HPDC),permanent mold casting(PMC),and sand casting(SC)techniques.The results indicated that with increasing Gd content,the grain sizes of the HPDC alloy had a slight change,but the grains of the PMC and SC alloys were significantly refined.Besides,the a cicular Al11RE3 phase was modified into the short-rod shape under the three casting conditions.The impact toughness of the studied alloy was mainly dominated by the absorbed energy during the crack initiation.With increasing Gd content,the impact toughness of the studied alloy monotonically increased due to the lower tendency of the modified second phase toward crack initiation.The im-pact stress was higher than the tensile stress,exhibiting a strain rate sensitivity for the mechanical response;however,the HPDC alloy had an in-consistent strain rate sensitivity during the impact event due to the transformation of the deformation mechanism from twinning to slip with in-creasing strain.Abundant dimples covered the fracture surface of the fine-grained HPDC alloys,indicating a typical ductile fracture.Neverthe-less,due to the deficient {10T2} twinning activity and the suppressed grain boundary sliding during the impact event,the HPDC alloys showed insufficient plastic deformation capacity.

Mg-Al-RE alloyGadoliniumMicrostructureImpact behavior

Jie Wei、Qudong Wang、Huisheng Cai、Mahmoud Ebrahimi、Chuan Lei

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National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Key Research and Development Program of China

U19022205167416651074106506740672016YFB0301001

2024

10.1016/j.jma.2022.06.014

镁合金学报(英文)

镁合金学报(英文)

EI
ISSN：2213-9567
年,卷(期)：2024.12(5)