compound casting - a literature review - YMCA University of Science ...

3 Al-Al CompoundCastingusing highpressuredie casting4 Mg-MgMagnesiummelt (pureMg or AJ62)is cast onto asolidmagnesiumsubstrate(AZ31) i.e(a)AZ31/AJ62and(b)AZ31/“Mg”compoundsProceedings of the National Conference onTrends and Advances in Mechanical Engineering,YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012dramatic weakening of theinterface chemical bond wasnoticed after T6 heat treatment.• After T6 treatment, the shape ofthe Si particles changes fromangular to round as a result of apartial re-dissolution at 540 ◦C.Moreover, the size and number ofthese particles decreasesignificantly in the vicinity of theinsert/alloy interface due to aselective migration of Si towardsthe Ti insert by solid-statediffusion.• The fabrication of an aluminium–aluminium compound wassuccessfully realized by highpressure die casting. Apermanent activation of an Alinsert’s surface was achieved bycombining zincate treatment andzinc galvanizing.• The layer reacts during thecasting process and a continuousmetallic transition forms. Widthas well as microstructure of thetransition zone between matrixand insert varies with varyinginitial layer thickness.CompoundCasting • A pre-treatment technique toenable the wettability of solidmagnesium substrates bymagnesium melts was realized.• By means of laboratory-scalecompound casting experimentsthe reproducible production ofall-magnesium compounds wassuccessfully established.• The newly developed joiningmethod eliminates manydisadvantages of conventionalapproaches, considering galvaniccorrosion, welding depth or lowprocess efficiency.• The coating, an easily depositedmetallic Zn/MgZn2 layer withgood adhesion, is applied viacombiningchemical,electrochemical and heattreatments. It leads to a completechange of the substrate’s surfacereactivity towards Mg melts,providing excellent wettability.• An area-wide, continuouslymetallurgic, defect-free and welldefinedtransition between AZ31505• Optical microscopy.• Scanning electronmicroscopy (SEMPhilips XL30).• The EDX system ofthe SEM are usedfor analysing theelement composition• Hardness testerusing a Vickersindenter.• The tensile tests areperformed with thetensile testingmachine.• Elongation ismeasured with anextensometer• Energy-dispersiveX-ray spectroscopy(EDX).• Scanning electronmicroscope (SEM,Camscan Series 4).• Microhardness.• Differentialscanningcalorimetry