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通过对添加B和Sb细化变质的ZL101合金进行固溶和时效处理,研究了热处理对合金显微组织和力学性能的影响.结果表明,添加B和Sb后,共晶Si由粗大片状变成细小针状,长条状初生α-Al等轴化.在相同热处理工艺下添加B和Sb的合金组织中共晶Si充分球化,尺寸分布更均匀,基体中析出时效相更多更弥散,此时合金显微硬度(HV)由未细化变质的102.4提高到114.6.当热处理工艺为540℃×6h固溶+190℃×5h时效时,添加B和Sb的合金抗拉强度和伸长率最高,分别为332.8MPa和11.73％,相比于未细化变质合金,提高了21.6％和90.7％,并且断口中出现大量均匀细小的等轴状韧窝结构.“,”The effects of the solution and aging heat treatment on the microstructure,hardness and tensile properties of ZL101 alloy with adding B and Sb were investigated.The results show that after adding B and Sb,the eutectic silicon becomes small accicular structure from coarse plate,and the long strip primary α-Al becomes equiaxed structure.At the same heat treatment process,the eutectic silicon in B and Sb modified alloys is spheroidizing fully with the more uniform size distribution,and the precipitated aging phase in the matrix is more dispersed.In addition,the microhardness of the alloy is increased from 102.4 HV to 114.6 HV compared with that without modification ones.When the heat treatment process is 540 ℃ × 6 h solution+ 190 ℃ × 5 h aging,the tensile strength and elongation of the B and Sb modified alloy reach 332.8 MPa and 11.73％,respectively,increased by 21.6％ and 90.7％,compared with those of the unmodified alloys,and a large number of uniform and fine equiaxed dimple structures appears in the fracture.