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- Title
Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy.
- Authors
Jie Wei; Guanghao Huang; Dongdi Yin; Kangning Li; Qudong Wang; Hao Zhou
- Abstract
Microstructure and mechanical properties development of extruded Mg-1Y (wt. %) binary alloy during equal channel angular pressing (ECAP) with route Bc at 400 °C, and subsequent annealing treatment between 300-400°C at different holding time of 5-120 min were investigated using an optical and scanning electron microscope (SEM), electron back scattered diffraction (EBSD), tensile test, and hardness test. The grain size of as-extruded material (~10.9μm) was refined significantly by 1-pass ECAP (~5.8μm), and resulted in a remarkably enhanced elongation to failure (EL) (~+62%) with a slightly decreased ultimate tensile strength (UTS) (~-3%) comparing to the as-extruded condition (EL = 11.3%, UTS = 200 MPa). The EL was further increased to 27.3% (~+142%) after four passes of ECAP comparing to the as-extruded condition, which was mainly caused by the much more homogenized microstructure. The split basal poles with about 60° rotations to the extruded direction (ED), the relatively coarsened grain size by static recrystallization (SRX) and post-dynamic recrystallization (PDRX) after four passes of ECAP might be responsible for the decreased strength with increasing ECAP pass. During the annealing treatment, recovery dominantly occurred at 300°C, SRX and grain growth emerged at 350°C and 400°C, respectively. Meanwhile, the grain grew and hardness decreased rapidly even within 5 min for 1-pass ECAPed material at 400°C, indicating a larger grain boundary mobility of ECAPed materials induced by higher deformation energy than the as-extruded ones.
- Subjects
SCANNING electron microscopes; ANNEALING of metals; METAL microstructure; MECHANICAL properties of metals; METAL extrusion
- Publication
Metals (2075-4701), 2017, Vol 7, Issue 4, p119
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met7040119