Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Evaluation of FSW Weldability of Wrought and Casting Mg Alloys

전신 및 주조된 Mg합금의 FSW 접합성 평가

  • 노중석 (부경대학교 공과대학 신소재공학부) ;
  • 김흥주 (포항산업과학연구원(RIST) 용접센터) ;
  • 장웅성 (포항산업과학연구원(RIST) 용접센터) ;
  • 방국수 (부경대학교 공과대학 신소재공학부)
  • Published : 2004.10.01
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Abstract

Friction stir weldability of AZ31B-H24, AZ61A-F and AZ91C-F Mg alloys were studied using microstructural observation and mechanical tests. The microstructure of stir zone(SZ) was coarse in AZ31B-H24 alloy whereas it was very fine both in AZ61A-F and AZ91C-F alloys. The hardness of SZ was remarkably increased by very fine recrystallized grains both in AZ61A-F and AZ91C-F alloys. On the other hand, the hardness of SZ was decreased in AZ31B-H24 due to the coarse microstructure. In SZ, AZ91C-F alloy showed very high hardness values because of dispersion hardening of $Mg_{17}$Al$_{12}$($\beta$ phase) and Al solid solution hardening. Because of more $Mg_{ 17}Al_{12}($\beta$ phase)$ intermetallic compounds, Mg alloy with high Al content showed poor mechanical properties.s.

Keywords

References

  1. Eun-Soo Park. Jae-Woo Kim. Do-Hyang Kim : Recent Development of High Strength, High Toughness Magnesium Alloys, Journal of the Korean Foundrymen's Society, 18-2 (1998), 118-123 (in Korean)
  2. Michael M.Avedesian : ASM Specialty Handbook, Magnesium and Magnesium Alloys, ASM international, 1999, 16-21
  3. Soon Chan Park, Kwang Seon Shin : Mg Alloys for Weight Reduction of Automobiles. Bulletin of the Korean Inst. of Met & Mat., 9-2 (1996), 160-171
  4. H HORI, H HINO : Application of friction Stir welding to the car body, Welding International 2003, 17(4), p287-292
  5. R Tova, C Gambaro, M Volpone : Friction Stir Welding, an innovative seam technology, Welding International 2003. 17 (1), 36-42 https://doi.org/10.1533/wint.2003.3053
  6. Dr. Richard Johnson, Dr. Philip Threadgill : Friction stir welding of magnesium alloys. TWII, 2-6 March 2003
  7. ASTM E112 : Standard Test Methods for Determining Average Grain Size
  8. Seung Hwan C.Park, Yutaka S. Sato, Hiroyuki Kokawa : Effect of micro-texture on fracture location in friction stir weld of Mg alloy AZ61 during tensile test. Scripta Materialia, 49 (2003). 161-166
  9. Qing-yu Shi, Terry Dickerson, Hugh R Shercliff : Thermo-Mechanical FE Modelling of Friction Stir Welding of Al-2024 Including Tool Loads, 4th International Symposium on Friction stir Welding, May, 2003, 1-12
  10. Kazuhiro Nakata, Young Gon Kim and Masao Ushio : FRICTION STIR WELDING OF MAGNESIUM ALLOYS, IWC-Karea 2002, KWS, 2002, 511-515
  11. Jong-Woong Kim, Won-Bae-Lee, Yun-Mo Yean. Seung-Boo Jung : The Joint Characteristics of Friction Stir Welded AZ91D Magnesium alloys, IWC-Korea 2002, 516-521