TY - JOUR
T1 - Effect of high-pressure torsion on grain refinement, strength enhancement and uniform ductility of EZ magnesium alloy
AU - Bryła, Krzysztof
AU - Morgiel, Jerzy
AU - Faryna, Marek
AU - Edalati, Kaveh
AU - Horita, Zenji
N1 - Funding Information:
The work in Kyushu University was supported by a Grant-in-Aid for Scientific Research (S) from the MEXT , Japan (No. 26220909 ). The HPT process was carried out in the International Research Center on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University .
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Strength enhancement of Mg-based alloys without deteriorating their ductility is currently a major scientific and industrial challenge. In this study, discs of as-cast EZ33A alloy were processed by high-pressure torsion (HPT). The coarse-grained cast material was turned to ultrafine-grained (UFG) of ∼240 nm, ∼135 nm and ∼127 nm size, after 1, 3 and 10 turns, respectively. Simultaneously, hardness increased from 60 HV for the as-cast material to 90–95 HV after HPT processing. Samples subjected to various HPT routes showed enhanced ultimate tensile strength of 270 MPa, along with their uniform elongation up to 10%. The simultaneous increase of strength and ductility was attributed to the bimodal grain size distribution, as well as to the fragmentation and redistribution of brittle (Mg,Zn)12Ce phase.
AB - Strength enhancement of Mg-based alloys without deteriorating their ductility is currently a major scientific and industrial challenge. In this study, discs of as-cast EZ33A alloy were processed by high-pressure torsion (HPT). The coarse-grained cast material was turned to ultrafine-grained (UFG) of ∼240 nm, ∼135 nm and ∼127 nm size, after 1, 3 and 10 turns, respectively. Simultaneously, hardness increased from 60 HV for the as-cast material to 90–95 HV after HPT processing. Samples subjected to various HPT routes showed enhanced ultimate tensile strength of 270 MPa, along with their uniform elongation up to 10%. The simultaneous increase of strength and ductility was attributed to the bimodal grain size distribution, as well as to the fragmentation and redistribution of brittle (Mg,Zn)12Ce phase.
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U2 - 10.1016/j.matlet.2017.10.113
DO - 10.1016/j.matlet.2017.10.113
M3 - Article
AN - SCOPUS:85032685010
SN - 0167-577X
VL - 212
SP - 323
EP - 326
JO - Materials Letters
JF - Materials Letters
ER -