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OALib Journal期刊
ISSN: 2333-9721
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相场法研究含第二相颗粒多晶体系的晶粒粗化标度律
DOI: 10.3724/SP.J.1037.2013.00164, PP. 981-988
Keywords: 相场方法,粗化动力学,结构函数,标度律
Abstract:
利用相场法研究了第二相颗粒体积分数对多晶体系晶粒粗化标度律的影响.结果表明随着第二相颗粒体积分数增加,晶粒生长阻力增大,晶粒平均半径Ra随时间t的演化关系偏离t=ARam+B非线性关系,且动力学指数m随第二相颗粒体积分数增加而增大.在晶粒粗化阶段,无论第二相颗粒是否存在,及第二相颗粒体积分数的大小,系统均满足标度律.随着第二相颗粒体积分数增加,系统结构因子曲线的峰值逐渐降低,且当波矢k值增大到某一值后,系统结构因子曲线基本重合;随着第二相颗粒体积分数增加,系统标度函数峰值降低,峰宽变宽.在较大的k值情况下,同一k值对应的标度函数值随第二相颗粒体积分数的增加而增大.由结构因子和标度函数可知,第二相颗粒体积分数增加,晶粒间的相互作用减弱,晶粒粗化过程中的尺寸均匀性将更好.
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