Author
Jun Ho Bae
Bio: Jun Ho Bae is an academic researcher from Yeungnam University. The author has contributed to research in topics: Alloy & Ultimate tensile strength. The author has an hindex of 5, co-authored 21 publications receiving 236 citations.
Papers
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TL;DR: In this article, cold pre-forging is used for improving the mechanical properties of extruded magnesium alloys, by inducing numerous twins in the billet, which in turn provides nucleation sites for dynamic recrystallization during extrusion.
104 citations
TL;DR: In this article, microstructural evolution of an indirect-extruded ZK60 alloy by adding 1 ¼ wt% Ce were investigated in the extruded condition, which showed a bimodal grain structure composed of fine recrystallized grains and coarse unrecrystallised grains.
64 citations
TL;DR: This paper showed that the precipitation behavior of β-Mg 17 Al 12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grain size.
53 citations
TL;DR: In this paper, the effect of initial grain size on the microstructural evolution and tensile properties of an extruded Mg-9Al-0.6Zn alloy was investigated using homogenized billets with grain sizes of 411 and 87μm.
Abstract: The effect of initial grain size on the microstructural evolution and tensile properties of an extruded Mg-9Al-0.6Zn alloy was investigated using homogenized billets with grain sizes of 411 and 87 μm. It is found that although dynamically recrystallized (DRXed) grains remain the same size regardless of the initial grain size, a finer-grained billet results in a significant reduction of the size and area fraction of un-DRXed grains through an increase in grain boundaries capable of acting as nucleation sites for DRX during hot extrusion. This increase in the fraction of DRXed grains, combined with more precipitates, improves the tensile yield strength of the extruded alloy. The elongation is also significantly improved, as the reduction in unDRXed grains suppresses the formation of twins that cause micro-cracks. This increased ductility subsequently results in an increase in ultimate tensile strength through continuous strain hardening.
32 citations
18 citations
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592 citations
TL;DR: Magnesium (Mg) alloys have received a significant interest in the past 20 years, owing to a nonlinearly increasing demand for lightweight structural materials as mentioned in this paper, and they have been used in a variety of applications.
Abstract: Magnesium (Mg) alloys have received a significant interest in the past 20 years, owing to a nonlinearly increasing demand for lightweight structural materials. Magnesium extrusions alloys to date h...
291 citations
TL;DR: In this paper, a review of recent researches on the rare-Earth free Magnesium alloys is presented, and the new strengthening mechanism, such as the solute clustering which was recently observed in Magnesium-Rare-Earth alloys and the other Rare-Earth-free Magnesium systems, is suggested.
246 citations
TL;DR: In this paper, some studies have confirmed that pre-twinning can be an effective way to enhance the strength, formability and mechanical anisotropy of magnesium alloys.
164 citations
01 Jan 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effects of cerium (Ce) addition on the microstructure and mechanical properties of ZK60 alloy were investigated using SEM, EBSD, and TEM.
Abstract: The effects of cerium (Ce) addition on the microstructure and mechanical properties of ZK60 alloy were investigated using SEM, EBSD, and TEM and by performing tensile tests of indirect-extruded ZK60 alloys with 0.5, 1.0, and 1.5 wt% Ce contents. The variation of hot workability due to Ce addition was also investigated by establishing processing maps of these alloys. The results revealed that Ce addition had an obvious influence, reducing the average grain size and weakening the basal fiber texture of the as-extruded ZK60 alloys; these changes were attributed to the promotion of dynamic recrystallization (DRX) by particle stimulated nucleation (PSN) at Mg–Zn–Ce particles. The yield and tensile strengths were improved by the Ce addition, while the elongation was decreased due to the hard Mg–Zn–Ce particles. It was also found that the hot workability improves up to the addition of 1.0 wt% Ce and then deteriorates.
152 citations