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용탄단조법에 의해 제조된 Mg-6Al-xZn(x=0 , 1 , 2) 합금의 용체화처리조건 규명
강민철,윤일성,김인배 ( Min Cheol Kang,Il Sung Yoon,In Bae Kim ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.4
This study has been investigated the influence of solid solution treatment on the microstructure of Mg-6Al-xZn(x=0, 1, 2) alloys fabricated by squeeze casting process. The products having clean surface and fine microstructure are fabricated by adopting the liquid metal forging method. The microstructures of as-fabricated state show β(Mg_(17)Al_(12)) precipitates between the dendrite boundaries. It is found that the hardness of the alloys is increased with increasing amount of zinc due to the solid solution hardening effect of zinc. In the changes of microstructure upon solid solution treatment time at 405℃, β phases are dissolved in α matrix up to 1hr and the microstructure are coarsened rapidly after 2hrs. The microhardness are decreased rapidly until lhr of solution treatment time and then stabilized. From the above results, it is concluded that the optimum solid solution treatment condition for Mg-6Al-xZn alloys is at 405℃ for 1hr. The solution treatment time is greatly reduced comparing to conventional casting(at 385∼418℃ for 10∼14hrs) due to the formation of the super-saturated solid solution by liquid metal forging.
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홍영준,정해용,김순호,강민철,김인배 ( Young Jun Hong,Hae Young Jeong,Soon Ho Kim,Min Cheol Kang,In Bae Kim ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.4
N/A Effect of aging treatment on the microstructural evolution of a rapidly solidified Al-3.56wt%Li-0. 97wt%Mg alloy were investigated by differential scanning calorimetry(DSC) and transmission electron microscopy(TEM). DSC analysis showed two exothermic and two endothermic peaks. The two exothermic and endothermic peaks corresponded to δ′and δ+T precipitation and dissolution reactions respectively. The enthalpy of δ´precipitation decreased with increasing of aging temperature and time until the finishing point of precipitation. The activation energy for precipitation of δ´ was measured as 78KJ/㏖ and the energy for dissolution was 95KJ/㏖. These values are higher than those of Al-Li binary alloy. Peak hardness value(Hv 155) was obtained at 210℃ for 1hr aging treatment which coincided with finishing point of δ´precipitation.
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Mg-Nd-Y-Zr-Zn 주조합금의 인장특성에 미치는 시효처리의 영향
김현식,예대희,강민철,김인배,Kim, Hyun-Sik,Ye, Dea-Hee,Kang, Min-Cheol,Kim, In-Bea 한국재료학회 2008 한국재료학회지 Vol.18 No.5
Magnesium alloys are alloyed with rare earth elements (Re, Ca, Sr) due to the limited use of magnesium in high-temperature conditions. In this study, the influences of Zr and Zn on the aging behavior of a Mg-Nd-Y alloy were investigated. magnesium alloys containing R.E elements require aging treatments Specifically, Nd, Y and Zr are commonly used for high-temperature magnesium alloys. Various aging treatments were conducted at temperatures of 200, 250 and $300^{\circ}C$ for 0.5, 1, 3, 6, and 10 hours in order to examine the microstructural changes and mechanical properties at a high temperature ($150^{\circ}C$). Hardness and high-temperature ($150^{\circ}C$) tensile tests were carried out under various aging conditions in order to investigate the effects of an aging treatment on the mechanical properties of a Mg-3.05Nd-2.06Y-1.13Zr-0.34Zn alloy. The maximum hardness was 67Hv; this was achieved after aging at $250^{\circ}C$ for 3 hours. The maximum tensile, yield strength and elongation at $150^{\circ}C$ were 237MPa, 145MPa and 13.6%, respectively, at $250^{\circ}C$ for 3 hours. The strengths of the Mg-3.05Nd-2.06Y-1.13Zr-0.34Zn alloy increased as the aging time increased to 3 hours at $250^{\circ}C$ This is attributed to the precipitation of a Nd-rich phase, a Zr-rich phase and $Mg_3Y_2Zn_3$.
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6N01 Al 합금의 미세조직 및 기계적 성질에 미치는 시효처리의 영향
김인배,강민철,강정윤,구흥서,윤인택 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.4
Effect of aging treatment on the microstructures and mechanical properties of 6N01 Aluminium alloy was investigated by differential scanning calorimetry. transmission electron microscopy. microhardness measurement and tensile test. It was found that the precipitation sequence of 6N01 Aluminium alloy was GP zone→metastable hexagonal Mg₂S₁(β˙)→equifibrium fcc-Mg₂S₁(β), and the precipitates at peak aged condition were GP zones and β˙ phase. Microhardness changes during over aged condition showed very small decrease upon increased aging time. This result was attributed to the very slow transformation rate of β˙ to β. Maximum hardness(116 Hv) and tensile strength(312.6㎫) with 22.3% elongation were obtained from the specimen aged at 180℃ for 15hrs.
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김인배,김순호,강민철,윤인택 釜山大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.55 No.-
6082 Al합금의 미세조직 및 기계적 성질에 미치는 시효처리의 영향을 시차주사열분석기, 투과전자현미경 및 미소경도 시험을 통하여 조사하엿다. 170℃, 9시간의 시효열처리에 의해서 118Hv의 최대경도값이 얻어졌으며, 이는 GP zone과 β'상의 석출에 의한 것이었다. 최대경도 이후의 경도 감소는 완만한 감소를 나타내었는데 이러한 결과는 β'에서 β로의 변태속도가 매우 늦다는 것을 의미한다. 이 합금의 석출과정은 GP zone →불안정 hcp Mg₂Si(β') →평형 fcc Mg₂Si(β)이었다. The effect of aging treatment on the microstructures and mechanical properties of 6082 aluminum alloy was investigated by differential scanning calorimetry, transmission electron microscopy and microhardness measurement. The maximum hardness(118Hv) was obtained from the specimen aged at 170℃ for 9hrs due to the formation of GP zones and metastable β' phase. In over-aged condition, decrement of hardness showed not so much. This results was attributed to the very slow transformation rate from β' to β phase. It was found that the precipitation sequency was GP zone→metastable hexagonal Mg₂Si(β') →equilibrium fcc Mg₂Si(β).
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