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利用XRD,SEM,TEM等实验方法,研究了铝热合成法制备的FeNiCrAl合金的微观组织,并研究了铝热剂成分中Al含量对合金拉伸性能的影响.结果表明,当铝热剂中Al含量不超过25.4%(质量分数)时,合金的主要组成相是奥氏体;当铝热剂中Al含量达到26.6%时,合金主要组成相为铁素体,同时析出颗粒状的NiAl相;随着Al含量继续增加,颗粒状析出相逐渐被编织状组织所取代.编织状组织的产生是液相调幅分解的结果.铝热剂中Al含量的增加,会降低合金的断后延伸率.当铝热剂中Al含量为26.6%时,合金的抗拉强度达到最大,为640.87MPa.
The microstructure of FeNiCrAl alloy prepared by aluminothermic synthesis was investigated by means of XRD, SEM and TEM. The effect of Al content in the composition of the thermite on the tensile properties of the alloy was also studied. When the content of Al is not more than 25.4% (mass fraction), the main phase of the alloy is austenite. When the Al content in the thermite reaches 26.6%, the main phase of the alloy is ferrite and the precipitated granular NiAl phase ; As the Al content continues to increase, the precipitated phase is gradually replaced by the weave-like structure. The weave-like structure is the result of the liquid phase amplitude modulation decomposition. The increase of Al content in the thermite will reduce the elongation at break of the alloy. When the aluminum thermite content of 26.6%, the tensile strength of the alloy reached the maximum of 640.87MPa.