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OALib Journal期刊
ISSN: 2333-9721
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铝热合成NiAl共格强化的FeNiCrAl合金的组织演化机理和力学性能
DOI: 10.11900/0412.1961.2014.00497, PP. 483-491
Keywords: 铝热反应,NiAl,拉伸性能,液相调幅分解
Abstract:
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.
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