Effect of minor aluminium addition in Cu47Ti34Zr11Ni8 bulk metallic glasses
(Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)
Abstract: Cu47Ti34Zr11Ni8 and (Cu47Ti34Zr11Ni8)99Al bulk metallic glass with size of 1mm×10mm×50mm were prepared by copper mold casting, and the influence of minor aluminium addition upon the alloy thermal stability and mechanical properties was studied. The results indicate that with the aluminium addition, the crystallizing behavior of the melt changes at the same cooling rate, and the crystallizing behavior of the glass changes at the same heating rate. The glass transition temperature(Tg), crystallization temperature(Tx1), temperature interval of supercooled liquid region ΔTx (=Tx1-Tg) and reduced glass transition temperature (Trg) are proved to be changed from 672K, 734K, 62K and 0.578 to 681K, 729K, 48K and 0.590, respectively. Because of the addition of aluminium, three point-bending flexural strength and flexural modulus of the bulk glass are increased from 2350MPa and 102GPa to 2970MPa and 108GPa, respectively.
Key words: bulk metallic glass(BMG)； copper-titanium-zirconium-nickel alloy； glass-forming ability(GFA)； thermal stability； mechanical property