等溫熱處理對ZC61-0.3Cr鎂合金半固態組織演變的影響

等溫熱處理對ZC61-0.3Cr鎂合金半固態組織演變的影響Effects of isothermal heat treatment on microstructural evolution ZC61-0.3Cr magnesium alloy

研究等溫熱處理溫度和保溫時間對ZC61-0.3Cr鎂合金半固態組織演變的影響。結果表明：在等溫熱處理過程中，ZC61-0.3Cr合金中的原始樹枝晶組織能夠轉變為半固態非枝晶組織，得到均勻、圓整的球狀顆粒。隨著保溫溫度的升高，合金中的原始樹枝晶組織經過初始粗化、組織分離和球化演變成半固態非枝晶組織；隨著保溫時間的延長，晶界處的(α-Mg+MgZn2+CuMgZn)共晶組織優先熔化，合金中的大塊狀組織逐漸演變為球狀組織；但是，保溫溫度過高或保溫時間過長，都會引起球狀顆粒的粗化長大。在粗化長大過程中，合并長大機制和Ostwald熟化機制同時存在，共同影響固相顆粒的形貌和尺寸大小。ZC61-0.3Cr鎂合金半固態成形所需的最佳工藝條件為(585 ℃, 30 min)；此條件下，其顆粒平均尺寸、形狀因子和固相率分別為43 μm、1.4和51%。

The effects of the isothermal heat-treatment temperature and holding time on semi-solid microstructural evolution of ZC61-0.3Cr magnesium alloy were investigated. The results indicate that the original dendritic microstructure in ZC61-0.3Cr alloy can be transformed into semi-solid non-dendritic microstructure and can obtain uniform and round spherical particles during the isothermal heat-treatment. With the increase of holding time, the eutectic microstructure (α-Mg+MgZn2+CuMgZn) at the grain boundaries is melted preferentially, the original dendritic microstructure in the alloy is turned into semi-solid non-dendritic microstructure by initial coarsening, microstructure separation and spheroidizing. As the holding time increases, the microstructure of alloy gradually changes from large block to spherality. However, the coarsening and growth of spherical particles would cause, when the holding temperature is too high or the holding time is too long. In the process of coarsening and growth, the mechanism of combining growth and Ostwald ripening coexist and together affect morphology and size of the solid phase particles. The optimum process condition for semi-solid forming of ZC61-0.3Cr magnesium alloy is (585 ℃, 30 min). Under this condition, the average particle size, shape factor and solid fraction are 43 μm, 1.4 and 51%, respectively.

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