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Grain-growth behaviors of TC4–DT alloy in a narrow temperature range (990 °C−1050 °C) were systematically investigated, and the effects of which on the lamellar structural evolution and mechanical properties were quantitatively evaluated. Microstructural observations indicated that prior  β  grain size increased with an increase in heat-treatment temperature and time, which was described by the modified Sellars model. The grain-growth exponent ( n  = 2.741) and activation energy ( Q  = 161.0 kJ mol −1 ) during  β  treatment were confirmed. The  α  colony size similar to  β  grain varied significantly with the heat-treatment conditions, while  α  plate thickness changed slightly. The Hall–Petch equation could qualitatively exhibit the relationships between the lamellar microstructure parameters (prior  β  grain size,  α  colony size, and  α  plate thickness) and mechanical properties (strength, ductility, and impact toughness). The fine prior  β  grain that contained different orientated  α  colonies produced more boundaries to hinder dislocation motion and crack propagation, which contributed a more circuitous crack growth path. The results indicated that the control of  α  colony size was critical to improve the mechanical performance of TC4–DT alloy.

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy