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中文摘要：
采用X射线衍射（XRD）和扫描电子显微镜（SEM）测试方法研究了Mg含量为6%和12%的Mo-Si-Mg混合粉末在球磨过程中相的演变规律、组织形貌以及热处理对球磨粉末的影响。结果表明：在球料比30∶1,转速304r·min^-1条件下,Mo-Si-Mg粉末球磨40h时才生成亚稳态β-MoSi2,球磨180h仍有残留的单质Mo。Mg对MoSi2的合成有阻碍作用,其合成机制是一种缓慢的反应模式,不是类自蔓延模式。球磨后得到粉末的形状近似球形,并发生了团聚现象。球磨粉末在900和1000℃退火处理1h后,亚稳态β-MoSi2全部转变为稳态α-MoSi2,并且产生了Mo5Si3新相。
英文摘要：
The influence of phase transition, microstructure and heat treatment on milled powder（Mo-Si-6%Mg, Mo-Si-12%Mg） were studied by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results showed that metastable β-MoSi2 phase was obtained after 40 h milling at 304 r·min^-1 with the ball-to-powder 30∶1. Increasing the milling time to 180 h, residual Mo still existed. Magnesium hindered the process of forming β-MoSi2. The synthesis of β-MoSi2 was because that the reaction took place in a gradual production mode, but did not propagate completely. With increasing milling time, the shape of particles changed to spherical clustered agglomerates. The annealing powder for different milling time at 900 and 1000 ℃ for 1h resulted in metastable state β-MoSi2 changing into stable state α-MoSi2. Mo and MoSi2 reacted to form Mo5Si3 phase.
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