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Evaluation of Inoculant Efficiency in Al Grain Refining Alloys.

机译：al晶粒细化合金中孕育剂效率的评价。

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It has been shown that the DET (Droplet Emulsion Technique) can be used to produce powder samples of grain refining master alloys that contain isolated inoculant particles of variable catalytic potency. The effectiveness and subsequent identification of inoculant particles in terms of their ability to produce grain refinement in bulk Al castings can also be distinguished by combining the DET with an interrupted nucleation quenching treatment during DTA. This quenching treatment allows for identification of potent inoculants by preserving droplet solidification microstructures associated with the nucleation and growth of Al from the effective particle population. The ability to separate droplets containing potent inoculant species allows examination and comparison of discrete inoculant characteristics such as intermetallic morphology. Because this quenching treatment is performed at a known measured temperature, the potent inoculant population is also characterized by a discrete heterogeneous nucleation response. Initial study results indicate that the DET used in conjunction with analytical x-ray and electron beam studies provides chemical and structural information about effective inoculant particles. Moreover, influential parameters which may hamper or accentuate the nucleation of grains by a statistical minority of inoculant particles can now be assessed in master alloy droplets and used to develop more effective catalyst particles. Heterogeneous nucleation; Aluminum alloys; Inoculation; Differential thermal analysis; Solidification microstructure; Grain refinement; Castings. Reprints. (edc)

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