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采用DTA，WDX和金相分析等方法研究测定了5％Sn－Ag－Cu－CU3P四元相图Cu角的部分变温截面；给出了该四元系五相平衡反应及各平衡相的成分；分析了该系钎料的强韧化机理．
The temperature profile of the Cu angle of 5% Sn-Ag-Cu-CU3P quaternary phase diagram was studied by DTA, WDX and metallographic analysis. The five-phase equilibrium reaction and the composition of each equilibrium phase The toughening mechanism of the brazing filler metal was analyzed.