Effect of multiaxial deformation on structure, mechanical properties, and corrosion resistance of a Mg-Ca alloy

被引:20
作者
Yurchenko, N. Yu [1 ]
Stepanov, N. D. [1 ]
Salishchev, G. A. [1 ]
Serebryany, V. N. [2 ]
Martynenko, N. S. [2 ]
Lukyanova, E. A. [2 ]
Rokhlin, L. L. [2 ]
Birbilis, N. [4 ]
Dobatkin, S., V [2 ,3 ]
Estrin, Y. Z. [4 ,5 ]
机构
[1] Belgorod State Natl Res Univ, Belgorod, Russia
[2] Russian Acad Sci, Fed State Budget Inst Sci, AA Baikov Inst Met & Mat Sci, Moscow, Russia
[3] Natl Univ Sci & Technol MISiS, Moscow, Russia
[4] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia
[5] Univ Western Australia, Dept Mech Engn, Nedlands, WA 6009, Australia
基金
俄罗斯科学基金会;
关键词
Metals and alloys; Multiaxial deformation; Microstructure; Recrystallization; Mechanical properties; Corrosion; MAGNESIUM ALLOY; PURE MG; BIODEGRADABLE MATERIALS; DEGRADATION BEHAVIOR; PLASTIC-DEFORMATION; FATIGUE PROPERTIES; MICROSTRUCTURE; BIOCOMPATIBILITY; CARBON; WE43;
D O I
10.1016/j.jma.2021.07.004
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
This article provides a report on the effect of multiaxial deformation (MAD) on the structure, texture, mechanical characteristics, and corrosion resistance of the Mg-0.8 (wt.)% Ca alloy. MAD was carried out on the alloy in the as-cast and the annealed states in multiple passes, with a stepwise decrease in the deformation temperature from 450 to 250 degrees C in 50 degrees C steps. The cumulative true strain at the end of the process was 22.5. In the case of the as-cast alloy, this resulted in a refined microstructure characterized by an average grain size of 2.7 mu m and a fraction of high-angle boundaries (HABs) of 57.6%. The corresponding values for the annealed alloy were 2.1 mu m and 68.2%. The predominant mechanism of structure formation was associated with discontinuous and continuous dynamic recrystallization acting in concert. MAD was also shown to lead to the formation of a rather sharp prismatic texture in the as-cast alloy, whilst in the case of the annealed one the texture was weakened. A displacement of the basal poles {00.4} from the periphery to the center of a pole figure was observed. These changes in the microstructure and texture gave rise to a significant improvement of the mechanical characteristics of the alloy. This included an increase of the ultimate tensile strength reaching 308 MPa for annealed material and 264 MPa for the as-cast one in conjunction with a twofold increase in ductility. A further important result of the MAD processing was a reduction of the rate of electrochemical corrosion, as indicated by a significant decrease in the corrosion current density in both microstructural states of the alloy studied. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.
引用
收藏
页码:266 / 280
页数:15
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