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Characterization of the Hot Deformation Behavior of a Al-Si Alloy Using Processing Maps

The compression tests of solution treatment ZL109 alloy have been performed in the compression temperature range from 250°C to 450°C and the strain rate range from 0.0005s-1 to 0.5s-1. A processing map has been developed on the basis of flow stress data obtained as a function of temperature and strain rate, which revealed two domains of hot working for the alloy: one is situated at temperature between 270°C and 340°C with strain rate between 0.05s-1 and 0.5s-1, the other is situated at the temperature between 380°C and 450°C with strain rate between 0.0005s-1 and 0.004s-1. Combining with the processing map, the optimum parameters of hot working for ZL109 alloy are that 300°C/0.5s-1 and 450°C/0.0005s-1, respectively. Microstructure observations indicated that DRX occurred in both these domains. The instable zones, i. e., adiabatic shear bands formation, wedge cracking, were also identified in the processing map and microstructural examination was performed for validation.