Research of Grain Refining on Pure Al by Three Different Master Alloys
The microstructures of Al-5Ti-1B,Al-10Ti and Al-4B master alloys were investigated by OM and XRD.The grain refining effects of these three master alloys on pure Al were also researched.The results show that Al-5Ti-1B master alloy is a composite of TiAl3,TiB2 and α-Al,Al-10Ti master alloy is comprised of TiAl3 and α-Al,the size of TiAl3 is uneven,Al-4B alloy is formed with AlB2 and α-Al.The refining efficiency of Al-5Ti-1B and Al-10Ti alloy on pure Al is fine,Al-4B alloy has little refining effect to pure Al.The refining efficiency of TiAl3 is essential,the addition of B element based on TiAl3 phase can further enhance the refining effect.