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Mc Hpdc
 

Mc Hpdc

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    Mc Hpdc Mc Hpdc Presentation Transcript

    • MC-HPDC Melt conditioned high pressure die casting BCAST ( B runel C entre for A dvanced S olidification T echnology) Brunel University UK
    • MC-HPDC process MC-HPDC = MCAST+ HPDC MCAST T/C Inlet T/C HPDC Machine
    • HPDC vs. MC-HPDC       AD91D HPDC MC-HPDC
    • Uniform microstructure throughout the component (LM24) f s =0.31 d=53  f s =0.32 d=54  f s =0.32 d=53  f s =0.30 d=53  f s =0.32 d=54  f s =0.32 d=53 
    • Property comparison AZ91D 125 150 175 200 225 250 275 0 2 4 6 8 Elongation (%) UTS (MPa) HPDC Thixo-cast Thixo-moulded MC-HPDC
    • Property comparison with other processes (357 alloy)       240 250 260 270 280 290 300 310 0 2 4 6 8 10 12 Elongation (%) UTS (MPa) New rheocasting (T5) Thixocasting (T5) MC-HPDC (F) MC-HPDC (T5)
    • Substantially increased fatigue life AZ91D
    • Direct recycling of Mg scrap AZ91D 0 50 100 150 200 250 300 100%Scrap 50%Scrap Primary Material Conditions Yield, UTS (MPa) 0 1 2 3 4 5 6 7 8 Elongation (%) Yield UTS Elongation
    • Increased Fe tolerant LM24 (Al-9.3Si-3.2Cu-1.58Zn-0.3Mn) LM25 (Al-10.3Si-0.3Cu-0.16Mn) Fe tolerance = 0.7wt% Fe tolerance = 0.37wt%
    • Advantages of MC-HPDC over HPDC
      • Increased fluidity and enhanced die filling due to dispersed oxide films and lumps of inclusions
      • Reduced melt temperature sensitivity
      • Reduced porosity (<0.5vol%) and well dispersed porosity
      • Reduced hot tearing
      • Fine and uniform microstructure throughout the entire component
      • Increased strength and ductility
      • Increased fatigue life
      • Direct recycling of scrap metal without degradation of properties
      • Increased tolerance to impurity elements
      • Increased range of die-castable alloys