等溫?zé)崽幚韺g-7Zn-0.3V合金半固態(tài)組織演變的影響

等溫?zé)崽幚韺g-7Zn-0.3V合金半固態(tài)組織演變的影響Effects of isothermal heat treatment on semi-solid microstructural evolution of Mg-7Zn-0.3V alloy

通過半固態(tài)等溫?zé)崽幚?，研究保溫溫度和保溫時間對Mg-7Zn-0.3V鎂合金把固態(tài)組織演變的影響。結(jié)果表明：保溫溫度和保溫時間對Mg-7Zn-0.3V非枝晶組織的演變有重要的影響。提高保溫溫度或是延長保溫時間，可以使Mg-7Zn-0.3V中的非枝晶組織轉(zhuǎn)變?yōu)楦蛹毿∏曳植季鶆虻那驙铑w粒。當保溫溫度過高或是保溫時間過長時，半固態(tài)顆粒會出現(xiàn)合并和長大，其主要的演變機制與Ostwald熟化規(guī)律相符合。Mg-7Zn-0.3V合金的最佳等溫?zé)崽幚砉に囀牵罕販囟?05 ℃，保溫時間40 min，非枝晶顆粒的平均尺寸為48.5 μm，形狀因子為1.26。

The effects of remelting temperature and holding time on microstructural evolution of Mg-7Zn-0.3V magnesium alloy were investigated by semi-solid isothermal heat treatment. The results indicate that the holding temperature and holding time have significant effects on microstructural evolution of the Mg-7Zn-0.3V alloy during isothermal temperature process. By increasing the holding temperature or prolonging the holding time, the non-endritic structures in Mg-7Zn-0.3V can be transformed into smaller and more uniform spherical particles.When the holding temperature is too high or holding time is too long, the semi-solid particles will combine and grow up, the microstructural evolution mechanism is consistent with the rule of Ostwald ripening mechansim. The best parameters of isothermal heat treatment are 605 ℃ holding temperature and 40 min holding time, obtaining the semi-solid microstructure with the average partial size of 48.5 μm and the roundness of 1.26.

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