The process of rapid omnidirectional compaction (ROC) of SiCp/cast Al composites was investigated. An apparatus for ROC process was established. Full compactibility of various SiCp/cast Al composites was accomplished....The process of rapid omnidirectional compaction (ROC) of SiCp/cast Al composites was investigated. An apparatus for ROC process was established. Full compactibility of various SiCp/cast Al composites was accomplished. Defects in the materials were eliminated. It is found that after ROC, the tensile strength of the 30% SiCp/Z1109 composite increased by 35%. It is demonstrated that the ROC process is an effective method for improving the performance of SiCp/Al composites.展开更多
Recently we have reported a number of bulk glass forming compositions in the CuHf-Ti system,with the critical thickness for complete glass formation,dc,ranging from 2 mm to 4 mm.In order to improve the glass forming a...Recently we have reported a number of bulk glass forming compositions in the CuHf-Ti system,with the critical thickness for complete glass formation,dc,ranging from 2 mm to 4 mm.In order to improve the glass forming ability （GFA） getting even larger dc,the prevailing approach is to use complex multicomponent systems.This strategy has been investigated by us for the Cu-Hf-Ti bulk glass forming alloy Cu55Hf25Ti20 using 〉1 at.pct additions of B,Y,Nb,Ta,Al,Mn,Si or V but with no significant improvement in the GFA.Clearly,it is necessary,in order to utilise the full potential of the base ternary system,to identify the best glass-forming compositions as a basis for extending the search into multi-dimensional compositional space.Thus,CuxHfyTiz alloys,where x=（40-70） at.pct,y=（5-30） at.pct,and z=（10-36） at.pct,were prepared by melt spinning andcopper mould suction-casting.The composition dependence of the GFA for the Cu-Hf-Ti alloys,as measured by dc for rod and ribbon samples,is reported over the composition range given above.展开更多
文摘The process of rapid omnidirectional compaction (ROC) of SiCp/cast Al composites was investigated. An apparatus for ROC process was established. Full compactibility of various SiCp/cast Al composites was accomplished. Defects in the materials were eliminated. It is found that after ROC, the tensile strength of the 30% SiCp/Z1109 composite increased by 35%. It is demonstrated that the ROC process is an effective method for improving the performance of SiCp/Al composites.
基金support of PAPIIT-UNAM IB100712SENER-CONACYT151496 in funding the project
文摘Recently we have reported a number of bulk glass forming compositions in the CuHf-Ti system,with the critical thickness for complete glass formation,dc,ranging from 2 mm to 4 mm.In order to improve the glass forming ability （GFA） getting even larger dc,the prevailing approach is to use complex multicomponent systems.This strategy has been investigated by us for the Cu-Hf-Ti bulk glass forming alloy Cu55Hf25Ti20 using 〉1 at.pct additions of B,Y,Nb,Ta,Al,Mn,Si or V but with no significant improvement in the GFA.Clearly,it is necessary,in order to utilise the full potential of the base ternary system,to identify the best glass-forming compositions as a basis for extending the search into multi-dimensional compositional space.Thus,CuxHfyTiz alloys,where x=（40-70） at.pct,y=（5-30） at.pct,and z=（10-36） at.pct,were prepared by melt spinning andcopper mould suction-casting.The composition dependence of the GFA for the Cu-Hf-Ti alloys,as measured by dc for rod and ribbon samples,is reported over the composition range given above.
