原位形变Cu-14.5%Fe复合材料的组织和性能研究(Ⅰ)——组织演变

Microstructure and Property of in Situ Deformed Cu-14.5%Fe Composites(Ⅰ)——Microstructure Evolution

研究了不同形变量时,原位形变Cu-14.5%Fe(体积分数)复合材料的显微组织的演变和Fe纤维的组织特征.结果表明,随拉拔过程形变量的增加,Cu-Fe合金凝固过程中形成的无序分布的Fe树枝晶逐渐转变为沿拉拔方向排列,并在横截面上形成卷曲的带状形貌,这是由于两相在大变形时,发生了织构取向作用的结果.通过显微组织的定量分析可知,Fe纤维间距d与形变量η间存在指数关系,即d=41.76exp(-0.411η);Fe纤维的厚度δFe和宽度bFe与形变量η分别满足ln(δFe)=3.396-0.686η,ln(bFe)=4.114-0.431η的关系.

The microstructure evolution and characteristics of Fe fibers of in situ deformed Cu-14.5%Fe composites were investigated.The results showed that the disordered Fe dendrites formed in solidification process of Cu-Fe alloys are rearranged along the drawing direction with the increasing deformation due to drawing and present the ribbon-like morphology on the transverse section.This is because of the texture orientation of the two different phases during large deformation.Based on the quantitative metallographic analysis,a relationship between interfiber spacing d and the drawing ratio η is given,i.e.,d=41.76exp（-0.411η）.Moreover,the relationships between the fiber thickness（δFe） and fiber width（bFe） and the drawing ratio can be expressed as ln（δFe）=3.396-0.686η and ln（bFe）=4.114-0.431η,respectively.