TY - JOUR

T1 - Development of segregations in a Mg–Mn–Nd alloy during HPT processing

AU - de Oliveira, Paula C.

AU - Montoro, Luciano A.

AU - Perez-Prado, Maria Teresa

AU - Hohenwarter, Anton

AU - Figueiredo, Roberto B.

AU - Isaac, Augusta

N1 - Publisher Copyright: © 2020 Elsevier B.V.

PY - 2021/10/23

Y1 - 2021/10/23

N2 - The present work evaluates the segregation of alloying elements during severe plastic deformation of a magnesium alloy. A Mg-1wt% Mn-1wt% Nd alloy was processed by high-pressure torsion and the microstructure was characterized by X-ray diffraction, scanning and transmission electron microscopy. High angular annular dark-field images were used to distinguish areas with segregated alloying elements. The results show that Nd readily segregates along boundaries in the early stage of deformation while Mn, which was dispersed as small particles in the starting material, undergoes slow fragmentation forming nanoparticles distributed throughout the microstructure and segregates along boundaries. The evolution of microhardness shows a rapid increase in strength at low imposed strains and saturates. It is suggested that Mn plays only a minor role in the contribution to the strength of this alloy because the slow development of nano-clusters and segregations of this element is not accompanied by changes in hardness.

AB - The present work evaluates the segregation of alloying elements during severe plastic deformation of a magnesium alloy. A Mg-1wt% Mn-1wt% Nd alloy was processed by high-pressure torsion and the microstructure was characterized by X-ray diffraction, scanning and transmission electron microscopy. High angular annular dark-field images were used to distinguish areas with segregated alloying elements. The results show that Nd readily segregates along boundaries in the early stage of deformation while Mn, which was dispersed as small particles in the starting material, undergoes slow fragmentation forming nanoparticles distributed throughout the microstructure and segregates along boundaries. The evolution of microhardness shows a rapid increase in strength at low imposed strains and saturates. It is suggested that Mn plays only a minor role in the contribution to the strength of this alloy because the slow development of nano-clusters and segregations of this element is not accompanied by changes in hardness.

KW - High-pressure torsion

KW - Magnesium alloy

KW - Segregation

KW - Severe plastic deformation

UR - http://www.scopus.com/inward/record.url?scp=85095852800&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2020.140423

DO - 10.1016/j.msea.2020.140423

M3 - Article

AN - SCOPUS:85095852800

VL - 802.2021

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

SN - 0921-5093

IS - 20 January

M1 - 140423

ER -