Metal foam is one of the most interesting materials in the field of functional materials. However, due to its various special properties such as super light weight, good energy absorption, high stiffness and outstanding damping capability, it has already become known as one of the most smart applica...
Metal foam is one of the most interesting materials in the field of functional materials. However, due to its various special properties such as super light weight, good energy absorption, high stiffness and outstanding damping capability, it has already become known as one of the most smart applicable material for many structural and functional uses in such various fields of automotives, transports, ships and aerospace applications. Particularly Al-foam filled composite materials are widely being considered these days for structural use in aircrafts and satellites, and also functional use in automotive bumpers, roofs and door beams for improving the crash-worthiness of vehicles which will ultimately reduce the damage of the vehicles and increase safety of the passengers during crushing. Industrial production of foamed metals is now established for applications like sandwich structures, panels, foam-filled crash absorbers, heat exchangers and so on. In present research, especially, aluminum alloy metallic foams which has various compressive strength to apply to foam-filled crash absorber is fabricated. and its mechanical properties were evaluated. Commonly, it is known that compression strength of the metal foam is related with density and cell size of metal foam. However, it is difficult to control them. Because complex thermal distribution of melt that caused by both of metal melt and air bubbles. In present research, however, heat treatable matrix material, 606X series aluminum alloy foam which is widely used in automotive and for architecture is introduced. And evaluate the improvement of compression strength by comparison study with pure aluminum metallic foam. Aluminum alloy including 6061 and 6063 aluminum alloy foams were prepared by down sprue foam casting method as follow steps. Individual Ca containing molten aluminum alloy was mechanically stirred. Then TiH2 is introduced in the molten aluminum alloy and subjected to subsequent stirring at 1000 rpm for 30 sec. Finally individually treated melt were poured into holding furnace at 680℃, 730℃ and 780℃. To controlling pore structure, quenching rates is regulated and measured by real-time measuring system. Compression strength and vickers hardness was also measured to evaluate the mechanical properties for energy absorbing materials. and it is compared with structural features by measured and calculated values of cell structure, cell size distribution and porosity Compression strength of various samples is increased with increasing foaming temperature and cooling rate. This is because of increasing of density and cell wall thickness caused by high cooling rate and low melt viscosity.
Metal foam is one of the most interesting materials in the field of functional materials. However, due to its various special properties such as super light weight, good energy absorption, high stiffness and outstanding damping capability, it has already become known as one of the most smart applicable material for many structural and functional uses in such various fields of automotives, transports, ships and aerospace applications. Particularly Al-foam filled composite materials are widely being considered these days for structural use in aircrafts and satellites, and also functional use in automotive bumpers, roofs and door beams for improving the crash-worthiness of vehicles which will ultimately reduce the damage of the vehicles and increase safety of the passengers during crushing. Industrial production of foamed metals is now established for applications like sandwich structures, panels, foam-filled crash absorbers, heat exchangers and so on. In present research, especially, aluminum alloy metallic foams which has various compressive strength to apply to foam-filled crash absorber is fabricated. and its mechanical properties were evaluated. Commonly, it is known that compression strength of the metal foam is related with density and cell size of metal foam. However, it is difficult to control them. Because complex thermal distribution of melt that caused by both of metal melt and air bubbles. In present research, however, heat treatable matrix material, 606X series aluminum alloy foam which is widely used in automotive and for architecture is introduced. And evaluate the improvement of compression strength by comparison study with pure aluminum metallic foam. Aluminum alloy including 6061 and 6063 aluminum alloy foams were prepared by down sprue foam casting method as follow steps. Individual Ca containing molten aluminum alloy was mechanically stirred. Then TiH2 is introduced in the molten aluminum alloy and subjected to subsequent stirring at 1000 rpm for 30 sec. Finally individually treated melt were poured into holding furnace at 680℃, 730℃ and 780℃. To controlling pore structure, quenching rates is regulated and measured by real-time measuring system. Compression strength and vickers hardness was also measured to evaluate the mechanical properties for energy absorbing materials. and it is compared with structural features by measured and calculated values of cell structure, cell size distribution and porosity Compression strength of various samples is increased with increasing foaming temperature and cooling rate. This is because of increasing of density and cell wall thickness caused by high cooling rate and low melt viscosity.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.