Effects of V and B Atomic Ratio on Microstructure and Grain Refinement Perfor-mance of Al-V-B Master Alloy
In order to investigate influence law of V and B atomic ratio on the refinement effect of Al-V-B master alloy,Al-V-B master alloys with different V and B atomic ratios were prepared.The influence of V and B atomic ratio on the microstructure composition and grain refinement performance of Al-V-B master alloy was analyzed.The results indicate that the amounts of small VB2 particles are significantly increased as V and B atomic ratio decreases,while the quantities of coarse Al3V particles are gradually reduced in Al-V-B master alloy.AlB2 phase appears with the V and B atomic ratio less than 1∶2.In addition,as the V and B atomic ratio declines,the grain refinement performance of Al-V-B master alloy is also enhanced,which reaches the optimal with the V and B atomic ratio of 1∶8.
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