Plastic Flow Characteristics of an Extruded Mg-Li-Zn-RE Alloy

Chen, Zhaoyun; Tong, Rui; Dong, Zichao

doi:10.1016/s1875-5372(14)60004-7

Cited by 11 publications

(1 citation statement)

References 19 publications

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“…Summarily, based on the present investigation and previous reports, Gd exhibited more notable strengthening effect than that of Nd and Ce, because as a heavy RE, Gd played roles in solid solution strengthening, precipitating strengthening, and grain refinement; as light RE, Nd, and Ce played roles only in grain refinement . It was also notable that Nd and Ce severely damage the ductility of Mg–3Li alloy, which probably owing to the GB segregation of those two REs and reduced the GB cohesion.…”

Section: Discussionsupporting

confidence: 76%

Strengthening Effect and Texture of Mg–3Li Alloys Strengthened by Various Rare‐Earth Elements

Bao

Zhang

2018

Adv Eng Mater

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Three Mg-3Li-0.4Zr alloys strengthened by various rare-earth elements (RE: Gd, Nd, and Ce) are prepared and studied to obtain the strengthening effect and texture. The results indicate that Gd exhibits a dramatic strength enhancement with minimum ductility decrease compared with Nd and Ce, which is primarily attributed to the effective pinning effect by the solid dissolved Gd atoms and a great amount of dispersing and homogeneously distributing precipitates with the size from nanometers to decades of nanometers. Moreover, the grain boundary segregated Gd is able to restrain the movement of grain boundaries, which is also the primary strengthening mechanism of Nd and Ce elements. Aging treatment shows improvement on mechanical properties of the three RE-containing alloys, but with little obvious effect. At last, Gd-containing Mg-3Li-0.4Zr alloy has good application potential as a kind of new superlight structural material. Pyramidal slip and tension twinning are the primary mechanisms in the early stage of the extrusion process. Basal slip becomes the primary mechanism accompanied by the transfer of texture from extrusion texture to RE-texture ( parallel to extrusion direction) when the complete dynamic recrystallization is achieved. The Experimental Material and ProceduresCommercial pure Mg (99.95%) and pure Li (99.9%), Mg-50%Gd, Mg-20%Nd, Mg-10%Ce, and Mg-30%Zr master alloys were used in this work to prepare three RE-containing alloys and a RE-free

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Section: Discussionsupporting

confidence: 76%