As suggested by Frank [1] an icosahedral short-range order should be energetically favoured in undercooled metallic melts. Such a short-range order is predicted to influence the energy of the interface between the liquid and a solid nucleus, depending on the structure of the solid phase [2]. This in turn decisively impacts the nucleation behaviour of solid phases from the undercooled melt, and ...

“A wonder created out of a tear drop” is an apt way to describe what Singapore is today compared to what it was just over forty years ago in 1965 when Singapore was thrown out of the Malaysian Federation. The tears that the nation saw in the eyes of the then young leader Lee Kuan Yew solidified the determination of the nation to rise against all odds. The rest is history; Singapore turned its v...

Intensive melt shearing was achieved using a twin-screw machine to condition an aluminium alloy prior to solidification. The results show that intensive melt shearing has a significant grain-refining effect. In addition, the intensive melt shearing reduces both the volume fraction and the size of porosity. It can reduce the density index from 10.50% to 2.87% and the average size of porosity in ...

In steels the dependence of ambient temperature microstructure and mechanical properties on solidification rate is not well reported. In this work we investigate the microstructure and hardness evolution for a low C low Mn NbTi-microalloyed steel solidified in the cooling rate range of 1-50 Cs-1. The maximum strength was obtained at the intermediate solidification rate of 30 Cs-1. This result h...