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对不同Al含量的FeV50进行熔化和随炉冷却试验,用X射线衍射(XRD),扫描电镜(SEM)分析检测物相和微观组织,结果表明:FeV50合金随Al含量的增加,其室温物相由单一的σ相逐渐向α相转变;Al含量存在临界值0.8%,低于0.8%时,FeV50为σ相,超过0.8%,将出现两相共存直至转变为单一的α相。分析认为Al对FeV50合金相变的影响机理表现在两个方面:①随Al含量的增加,合金液的临界晶核尺寸逐渐变大,使得体系中没有过多的能量作为α→σ相变的驱动力;②Al含量越高,其对Fe原子扩散的抑制作用越强,Fe的同素异构转变不能进行,从而阻止α→σ相变的发生。
The FeV50 alloy with different Al contents was melted and cooled in the furnace. The phase and microstructure were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that with the increase of Al content, From a single sigma phase to α phase, the content of Al is 0.8%. Below 0.8%, the phase of FeV50 is more than 0.8%. The coexistence of two phases will occur until a single α phase is formed. The analysis shows that the mechanism of Al affecting the phase transformation of FeV50 alloy is manifested in two aspects: (1) As the Al content increases, the critical nucleus size of the alloy solution becomes larger gradually, so that there is not too much energy in the system as α → σ phase transformation The higher the content of Al is, the stronger its inhibitory effect on the diffusion of Fe atoms is, and the allotropic transformation of Fe can not be carried out, so as to prevent the occurrence of α → σ phase transformation.