Effect of High Pressure Aging Treatment on Microstructure and Properties of Infiltrated Cu-W Alloy
Author of the article:XU Hong;ZHAO Jun
Author's Workplace：Institute of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China;Department of Materials and Engineering, North China Institute of Aerospace Engineering, Langfang 065000,China
Key Words：Cu-W alloy pressure aging treatment microstructur property
Abstract：
The normal pressure and high pressure aging treatments of infiltrated Cu-W alloys by different processes were carried out. The microstructures, mechanical properties and electrical conductivity of the alloy obtained by two ageing processes were analyzed by means of metallographic microscopy, scanning electron microscope, ransmission electron microscope, hardness tester and resistivity tester. The effect of high pressure aging treatment on the microstructure and properties of Cu-W alloy was discussed. The results show that high pressure aging treatment can increase the density of Cu-W alloy and the precipitate distribution in the tissue is more dispersed and finer, consequently, the mechanical properties and electrical conductivity of Cu-W alloy are improved. Higher hardness, compressive yield strength and lower resistivity of the alloy can be obtained by solid solution at 950 ℃ for 1 h and aging at 500 ℃ for 1 h at 3 GPa pressure, its values are 164 HV, 221 MPa and 4.415×10-8Ω·m, respectively. The hardness and compressive yield strength of the alloy increased by 21.48% and 31.55%, but the resistivity decreased by 8.89% compared with that of the alloy treated by the same process under normal pressure.
