분사주조한 Al 6061 합금의 Mg/Si 첨가량의 변화에 따른 기계적 특성 고찰

A Study on the Mechanical Properties of Spray-cast Al 6061 Alloy with Variation of Mg/Si Content

  • 이재성 (인하대학교 신소재공학부) ;
  • 김명호 (인하대학교 신소재공학부)
  • Lee, Jae-Sung (Division of Material Science & Engineering, Inha University) ;
  • Kim, Myung-Ho (Division of Material Science & Engineering, Inha University)
  • 발행 : 2008.07.20

초록

Mechanical properties of the spray-cast Al 6061 alloy with variation of Mg/Si addition were investigated. After spray-cast, hot extrusion was performed at $460^{\circ}C$ then followed ageing treatment to the T6 condition. SEM, EDX, and XRD were used to characterize a ${\beta}(Mg_{2}Si)$ precipitate. The amount of ${\beta}$ precipitate was calculated from the XRD measurements. Hardness, ultimate tensile strength and elongation were tested then compared with those of the Al 6061 alloys made by ingot metallurgy (I/M) and powder metallurgy (P/M). The ultimate tensile strength and elongation of the spray-cast Al 6061 alloy were 318MPa and 16.5%, respectively. These properties were improved in the 2.2 wt%Mg and 1.3wt%Si addition up to 349MPa of UTS and 12.5% of elongation, mainly due to increased amount of a fine supersaturated ${\beta}(Mg_{2}Si)$ precipitate.

키워드

참고문헌

  1. Myung-Ho Kim, Cha-Hurn Bae, Hae-Young Jeong and Heung-Il Park: Jounal of the Korea Foundrymen's society, "Microstructure and Theral Behaviors of Drolets During the Formation of Particle Reinforced Metal Matrix Composites by Spray Casting Process 12(4) (1992) 326-334
  2. P.C. Mathur: "Analysis of the Spray Deposition Process", Ph.D. Thesis, Drexel University
  3. Jin Forrest, Richard Price and David Hanlon: The Int. J. of Powder Metallurgry, "Manufacturing clad products by spray forming" 33 (1997) 21
  4. S. Hariprasad and S.M.L. sastry: JOM, "Processing Maps for Optimizing Gas Atomization and Spray Deposition" 47 (1995) 56-59
  5. Chong-Sung Park, In-Woo Lee and Myung-Ho Kim: Jounal of the Korea Foundrymen's society, "Characteristics in Microstructure of Particle Reinforced Al Matrix Composites Fabricated by Spray-Cast Forming Proccess 14(6) (1994) 530-540
  6. LIU Hong, ZHAO Gang, LIU Chun-ming, ZUO Liang : Nonferrous Met, "Effects of magnesium content on phase constituents of Al-Mg-Si-Cu alloys" 16 (2006) 376-381 https://doi.org/10.1016/S1003-6326(06)60064-2
  7. C. Ravi, C. Wolverton: Acta Materialia, "First-principles study of crystal structure and stability of Al-Mg-Si-(Cu) precipitates" 52(2004) 4213-4227 https://doi.org/10.1016/j.actamat.2004.05.037
  8. J.C.Huang, C.S.Shin and S.L.I.Chan: International Journal of Fatigue, "Effect of temper, specimen orientation and test temperature on tensile and fatigue properties of wrought and PM AA6061-alloys" 26 (2004) 691-703 https://doi.org/10.1016/j.ijfatigue.2003.11.006