Improvement of tensile properties of Al–Si alloys through directional solidification

Deformation twinning feature and its effects on significant enhancement of tensile ductility in columnar-grained Fe–6.5wt.%Si alloy at intermediate temperatures

“…The reported mechanisms can be concluded as: columnar grains can reduce casting defects [16], decrease the inhibiting effect of grain boundary on the dislocation motion [17] and increase the consistency of strain-induced phase transformation [18] in the alloys. In addition, for the alloys which are prone to intergranular fracture (such as Ni 3 Al [17]), grain boundary acts as potential source of cracks.…”

“…However, different alloys had different mechanisms for the enhanced mechanical property. For AleSi alloy which formed casting defects easily [16], the mechanical property of this alloy with columnar grains fabricated by directional solidification could be improved because of the less casting defects and the compact microstructure. For Ni 3 Al alloy which exhibited grain boundary embrittlement [17], the mechanical property of this alloy with columnar grains fabricated by directional solidification could be improved because of the low-energy grain boundary which could resist the intergranular cracks.…”

Direction Dependence of Compressive Properties of Mg Processed by Directional Solidification

“…High ductility is often attained in directionally solidified metals. 8,12) However, it is demonstrated from Fig. 3 that ductility of the directionally solidified Mg strongly depends on the loading direction.…”

“…[6][7][8] Directional solidification process has been studied in Mg alloys as well. [9][10][11] Recently, it has been reported that a directionally solidified Mg alloy shows higher strength at elevated temperature than a non-directionally solidified Mg alloy.…”

“…Besides, high ductility can be attained in directionally solidified metals. 8,12) Mechanical properties of directionally solidified metals exhibit the strong direction dependence. Therefore, it is important to investigate influence of the direction on mechanical properties of a directionally solidified Mg.…”