The bending strength and fracture behaviors of Ni50Mn29Ga21 alloy with terbium were investigated.The results show that the bending strength of the alloy is increased dramatically with the increase of terbium content.T...The bending strength and fracture behaviors of Ni50Mn29Ga21 alloy with terbium were investigated.The results show that the bending strength of the alloy is increased dramatically with the increase of terbium content.The fracture appearance of the sample without terbium is dominated by grain boundary fracture,while that with terbium is dominated by cleavage fracture with the increase of terbium content.Moreover,the grains are refined obviously and the oxygen content is decreased after adding terbium.展开更多
The compressor of composite gear teeth is a new type of rotor compressor withpartial built-in compression process. Analysis of its thermodynamic process indicates that thebuilt-in process is incomplete. The thermodyna...The compressor of composite gear teeth is a new type of rotor compressor withpartial built-in compression process. Analysis of its thermodynamic process indicates that thebuilt-in process is incomplete. The thermodynamic process of the compressor of composite gear teethcan be considered as five processes; the suction process, the isometric process, the compressionprocess, the pressure-balance process at high pressure and low pressure gas, and discharge process.Here, it is necessary to explain further the pressure-balance process. The pressure-balance processis isometric process. It is found that the isometric process of gas in chamber A whose capacity is83 percent of total work volume can be eliminated basically through extending the discharge port toconnect early the discharge port with the chamber B. By the above-mentioned method, the loss ofenergy will be reduced.展开更多
基金Item Sponsored by National Key Fundamental Research Development Project of China(2001AA327022)
文摘The bending strength and fracture behaviors of Ni50Mn29Ga21 alloy with terbium were investigated.The results show that the bending strength of the alloy is increased dramatically with the increase of terbium content.The fracture appearance of the sample without terbium is dominated by grain boundary fracture,while that with terbium is dominated by cleavage fracture with the increase of terbium content.Moreover,the grains are refined obviously and the oxygen content is decreased after adding terbium.
文摘The compressor of composite gear teeth is a new type of rotor compressor withpartial built-in compression process. Analysis of its thermodynamic process indicates that thebuilt-in process is incomplete. The thermodynamic process of the compressor of composite gear teethcan be considered as five processes; the suction process, the isometric process, the compressionprocess, the pressure-balance process at high pressure and low pressure gas, and discharge process.Here, it is necessary to explain further the pressure-balance process. The pressure-balance processis isometric process. It is found that the isometric process of gas in chamber A whose capacity is83 percent of total work volume can be eliminated basically through extending the discharge port toconnect early the discharge port with the chamber B. By the above-mentioned method, the loss ofenergy will be reduced.
