通过对混合元素法Ti-Fe合金烧结过程中的膨胀/收缩行为、淬火态和烧结态显微组织的分析,研究了添加铁对混合元素法Ti-Fe合金的烧结行为和组织演化的影响.结果表明:铁元素对钛粉末的烧结行为的影响可分为2个阶段:(1)铁元素的扩散均匀化;(2)单相的β-Ti(Fe)的烧结致密化.在升温速率为5 K/min和铁含量为5w/%的情况下,铁元素在Ti-Fe系的第1共晶点(1 085℃)之前就完全固溶到钛基体中,瞬时液相并没有出现.添加铁元素促进了Ti-Fe合金的烧结致密化.随着铁含量的提高,原始β晶粒平均尺寸及片状α晶团(Colony)的平均尺寸略有增加,α片的平均厚度急剧下降.铁的高扩散速率和铁的β相稳定效果是导致这些结果的主要原因.
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