二次重熔工艺对ZA92镁合金半固态浆料固相颗粒的影响

发布时间：2018-04-28 06:56

  本文选题：ZA镁合金 + 二次重熔　； 参考：《铸造》2015年11期

【摘要】：采用自孕育法制备ZA92镁合金半固态坯料,研究了二次重熔温度和时间对ZA92镁合金半固态固相颗粒的影响。结果表明:二次重熔温度升高和重熔时间的延长,合金的固相率减小,平均晶粒尺寸和平均圆整度呈现先减小后增大的变化趋势。当在570~580℃保温30 min或在590℃保温20 min时,可获得理想的半固态浆料固相颗粒,其平均晶粒尺寸、圆整度和固相率分别在83~86μm、1.37~1.59和62.3%~67.8%。晶粒前期以根部熔断和亚晶界分离机制进行分离,后期晶粒的球化、粗化满足LSW理论。
[Abstract]:Semisolid billets of ZA92 magnesium alloys were prepared by self-inoculation method. The effects of secondary remelting temperature and time on semi-solid solid particles of ZA92 magnesium alloys were studied. The results show that with the increase of remelting temperature and the prolongation of remelting time, the solid phase ratio of the alloy decreases, and the average grain size and average roundness decrease first and then increase. The ideal solid particles of semi-solid slurry can be obtained at 570,580 鈩，

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