摘要
将等通道转角挤压(ECAP)应用到非连续增强钛基复合材料中。采用通道夹角Φ=120°实现了(Ti B+Ti C)/Ti6Al4V钛基复合材料1~4道次Bc路径的ECAP变形,研究了剧烈塑性变形对微观组织演化和力学性能的影响。结果表明,剧烈塑性变形可以实现Ti B纤维和Ti C颗粒的细化,以及基体晶粒的细化;随着挤压道次的增加,基体中偏聚的Ti B细长纤维和Ti C大颗粒也逐渐趋于均匀化,力学性能也得到了提高,3道次后抗拉强度能够提高至1205 MPa,延伸率与挤压1道次相比也得到了明显提高。
The equal channel angular pressing(ECAP) was applied to strengthen the discontinuous Ti B+Ti C reinforced titanium alloy.The microstructural evolution mechanism during severe plasitic deformation processing was studied.The grain refinement,the deformation mechnism and formation mechnism were focused on in the preparation of ultrafine grain composite.The results indicate that the refinement of Ti B fibers and Ti C particles could be obtained,as well as the grain size of the matrix alloy.With the increasing of ECAP pass number,the clustered long Ti B fibers and Ti C big particles are also homogenized in the matrix,resulting in an improvement of the mechanical properties.After 3 rd pass,the tensile strength is up to 1205 MPa,and the elongation improves comparing with the first ECAP pass.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第S1期56-60,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51371114
51501112)
西北工业大学凝固技术国家重点实验室开放课题(SKLSP201620)
关键词
金属基复合材料
超细晶
剧烈塑性变形
变形行为
微观组织
metal matrix composites
ultrafine-grain
severe plastic deformation
deformation behavior
microstructure
