1×1. 25.0 L 755° ,+L 700 640 586 15 L 27.0 415 11 350 300 +I 200/1.3 8.2189 +0186993 Etn n,% Cu-Sn二元合金相图 70 630.7 600 50 327.5 300 251.2 <Pb) (Sb)t 10· Pb102030405060708090St PbSb二元合金相图