【摘 要】
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Microalloying is an effective method to improve the comprehensive properties of copper alloys.The effects of magnesium on the microstructure,mechanical properties and anti-stress relaxation properties of CuNiSi alloys have been investigated.Results demons
【机 构】
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State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;School
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Microalloying is an effective method to improve the comprehensive properties of copper alloys.The effects of magnesium on the microstructure,mechanical properties and anti-stress relaxation properties of CuNiSi alloys have been investigated.Results demonstrated that magnesium plays significant roles in refining the dendritic microstructure of the as-cast ingot,accelerating the precipitation decomposition,improving the mechanical properties and increasing the anti-stress relaxation properties.The incremental strength increase is due to the Orowan strengthening from the nanoscale Ni2Si and Ni3Al precipitates.As compared with the Cu-6.0Ni-1.0Si-0.5Al (wt％) alloy,the ultimate tensile strength of the designed Cu-6.0Ni-1.0Si-0.5Al-0.15Mg (wt％) alloy increases from 983.9 to 1095.7 MPa,and the electrical conductivity decreases from 27.1 to 26.6％ IACS,respectively.The stress relaxation rates of the designed Cu-6.0Ni-1.0Si-0.5Al-0.15Mg alloy are 4.05％ at 25 ℃,6.62％ at 100 ℃ and 9.74％ at 200 ℃ after having been loaded for 100 h,respectively.Magnesium significantly promotes nucleation during precipitation and maintains small precipitate size.
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