热处理对挤压铸造ZA43—Mn合金组织和性能的影响

研究了热处理对冲头式挤压铸造ZA43-Mn合金显微组织和力学性能的影响。结果表明：挤压铸造ZA43-Mn合金的时效处理使α和β相分解，枝晶偏析减轻，富锰相碎化与钝化，可提高其塑性（δ5=18%）。固溶处理使富锰相和富铜相分解，基体内二次相弥散析出，晶间组织形态和分布改善，可获得较高强度的铸件（δb=510MPa)。

Influence of Heat Treatment on the Microstructure and Properties of ZA43-Mn Alloy by Punch Squeeze Casting

Influence of heat treatment on the microstructure and mechanical properties of ZA43-Mn alloy in punch squeeze casting has been studied. The results showed that plasticity of squeez casting ZA43-Mn alloy can be imp roved by aging treatment (σ5 =18%,σb =430 MPa), as a result of α and β phases in alloy decomposition, dendritic segre gation alleviation, Mn-rich phase passivation and disintegration. The casting w ith high strength (σ5 =10%,σb =510 MPa)can be a chieved by solution treatment making Mn-rich and Cu-rich phases to be decomposed, secondary dispersed phase in matrix to be precipitated and the morphology and distribution of inter-dendritic structure to be improved.