Foamed metal has become an attractive material, which has unique physical, thermal, acoustic, damping and mechanical properties because a large amount of pores are distributed in the metal matrix. Therefore, metal foam can be used for the light weight application in automotive, locomotive, aerospace...
Foamed metal has become an attractive material, which has unique physical, thermal, acoustic, damping and mechanical properties because a large amount of pores are distributed in the metal matrix. Therefore, metal foam can be used for the light weight application in automotive, locomotive, aerospace fields. Aluminum foams have been developed successfully and will be employed in the next generation of energy absorption boxes. Magnesium alloys are most eligible candidate to substitute aluminum alloy, especially for lighter and higher damping applications in wide industrial fields. Magnesium alloy foams are expected to be particularly advantageous due to two thirds the density of aluminum. Melt and powder metallurgical (PM) processes have been widely used for manufacturing of metal foams. The PM process has some merits of flexibility of alloy composition and near to the net shape foaming, the preparation of optional alloy powder requires relatively high cost. However, melt foaming process, including addition of a blowing agent, is one of the attractive fabrication methods for making foamed metal due to its low manufacturing cost and it can form large bulk and it has been applied successfully to Al alloy foams. But few references have been found to prepare Mg alloy foam. In this study, melt foaming method was used to prepare the magnesium alloy foam. Usual blowing agent for forming pores is titanium hydride which can not be applied to prepare magnesium foam because of high hydrogen solubility of magnesium. Therefore, the blowing agent should be changed hydrogen into others. Calcium dihydroxide and calcium carbonate were chosen as blowing agent. The magnesium alloy foams with homogeneous pore structure were successfully prepared. Moreover, fabricated Mg alloy foams were mechanically evaluated by vickers hardness, quasi-static compression and damping test. As a result, pore structures were getting poor with increasing foaming temperature. Mechanical properties were increased with increasing viscosity and cell wall thickness.
Foamed metal has become an attractive material, which has unique physical, thermal, acoustic, damping and mechanical properties because a large amount of pores are distributed in the metal matrix. Therefore, metal foam can be used for the light weight application in automotive, locomotive, aerospace fields. Aluminum foams have been developed successfully and will be employed in the next generation of energy absorption boxes. Magnesium alloys are most eligible candidate to substitute aluminum alloy, especially for lighter and higher damping applications in wide industrial fields. Magnesium alloy foams are expected to be particularly advantageous due to two thirds the density of aluminum. Melt and powder metallurgical (PM) processes have been widely used for manufacturing of metal foams. The PM process has some merits of flexibility of alloy composition and near to the net shape foaming, the preparation of optional alloy powder requires relatively high cost. However, melt foaming process, including addition of a blowing agent, is one of the attractive fabrication methods for making foamed metal due to its low manufacturing cost and it can form large bulk and it has been applied successfully to Al alloy foams. But few references have been found to prepare Mg alloy foam. In this study, melt foaming method was used to prepare the magnesium alloy foam. Usual blowing agent for forming pores is titanium hydride which can not be applied to prepare magnesium foam because of high hydrogen solubility of magnesium. Therefore, the blowing agent should be changed hydrogen into others. Calcium dihydroxide and calcium carbonate were chosen as blowing agent. The magnesium alloy foams with homogeneous pore structure were successfully prepared. Moreover, fabricated Mg alloy foams were mechanically evaluated by vickers hardness, quasi-static compression and damping test. As a result, pore structures were getting poor with increasing foaming temperature. Mechanical properties were increased with increasing viscosity and cell wall thickness.
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