Journal of Powder Materials

Han-Gyoung Cho

2 Articles

[English]
Bi-materials of Al-Mg Alloy Reinforced with/without SiC and Al₂O₃ Particles; Processing and Mechanical Properties: Si-Young Chang, Han-Gyoung Cho, Yang-Do Kim; J Korean Powder Metall Inst. 2007;14(6):354-361.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.354

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The bi-materials with Al-Mg alloy and its composites reinforced with SiC and Al_2O_3 particles were prepared by conventional powder metallurgy method. The A1-5 wt%Mg and composite mixtures were compacted under 150sim450;MPa, and then the mixtures compacted under 400 MPa were sintered at 773sim1173K for 5h. The obtained bi-materials with Al-Mg/SiCp composite showed the higher relative density than those with Al-Mg/Al_2O_3 composite after compaction and sintering. Based on the results, the bi-materials compacted under 400 MPa and sintered at 873K for 5h were used for mechanical tests. In the composite side of bi-materials, the SiC particles were densely distributed compared to the Al_2O_3 particles. The bi-materials with Al-Mg/SiC composite showed the higher micro-hardness than those with Al-Mg/Al_2O_3 composite. The mechanical properties were evaluated by the compressive test. The bi-materials revealed almost the same value of 0.2% proof stress with Al-Mg alloy. Their compressive strength was lower than that of Al-Mg alloy. Moreover, impact absorbed energy of bi-materials was smaller than that of composite. However, the bi-materials with Al-Mg/SiCp composite particularly showed almost similar impact absorbed energy to Al-Mg/Al_2O_3 composite. From the observation of microstructure, it was deduced that the bi-materials was preferentially fractured through micro-interface between matrix and composite in the vicinity of macro-interface.

Citations

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Effect of Heat Treatment on Microstructure and Mechanical Properties of Electromagnetic Duo-Cast Al Hybrid Material
Jun Young Suh, Sung Jin Park, Do-Kyun Kwon, Si Young Chang
Korean Journal of Materials Research.2018; 28(9): 499. CrossRef
Microstructure and Mechanical Behavior of Al-Mg-Si/Al Hybrid Alloy by Duo-casting
Ji-Min Han, Chong-Ho Kim, Jun-Pyo Park, Si Young Chang
Journal of the Korea Foundry Society.2012; 32(6): 269. CrossRef
Microstructure and Tensile Properties of Al-Mn/Al-Si Hybrid Aluminum Alloy Prepared by Electromagnetic Duo-Casting
Sung-Jin Park, Tingju Li, Chong-Ho Kim, Jun-Pyo Park, Si-Young Chang
Korean Journal of Materials Research.2012; 22(2): 97. CrossRef

[Korean]
Characteristics of Plasma Electrolytic Oxidation Coatings on Mg-Zn-Y Alloys Prepared by Gas Atomization: Si-Young Chang, Han-Gyoung Cho, Du-Hyung Lee, Taek-Soo Kim; J Korean Powder Metall Inst. 2007;14(6):372-379.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.372

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Abstract PDF

The microstructure, mechanical and electrochemical properties of plasma electrolytic coatings (PEO) coatings on Mg-4.3 wt%Zn-1.0 wt%Y and Mg-1.0 wt%Zn-2.0 wt%Y alloys prepared by gas atomization, followed by compaction at 320 for 10 min under the pressure of 700 MPa and sintering at 380 and 420 respectively for 24 h, were investigated, which was compared with the cast Mg-1.0 wt%Zn alloy. All coatings consisting of MgO and Mg_2SiO_4 oxides showed porous and coarse surface features with some volcano top-like pores distributed disorderly and cracks between pores. In particular, the surface of coatings on Mg-1.0 wt%Zn-2.0 wt%Y alloy showed smaller area of pores and cracks compared to the Mg-4.3 wt%Zn-1.0 wt%Y and Mg-1.0 wt%Zn alloys. The cross section micro-hardness of coatings on the gas atomized Mg-Zn-Y alloys was higher than that on the cast Mg-1.0 wt%Zn alloy. Additionally, the coated Mg-1.0 wt%Zn-2.0 wt%Y alloy exhibited the best corrosion resistance in 3.5%NaCl solution. It could be concluded that the addition of Y has a beneficial effect on the formation of protective and hard coatings on Mg alloys by plasma electrolytic oxidation treatment.

Citations

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The Aging Characteristics of Mg-6 wt.% Al-1 wt.% Zn Alloy Prepared by Gas Atomization
Du-Hyung Lee, Bo-Sik Kim, Si-Young Chang
Journal of Korean Powder Metallurgy Institute.2009; 16(4): 275. CrossRef

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