CuZnAl粉末烧结体材料挤扭成形致密化的热力耦合数值模拟  

Thermo-mechanical Coupling Numerical Simulation of Densification of CuZnAl Powder Sintered Materials by Twist Extrusion Forming

作　　者：李悦[1] 李永志[1,2] 谢玉敏 

机构地区：[1]九江学院机械与材料工程学院,江西九江332005 [2]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《热加工工艺》2018年第1期185-188,194,共5页Hot Working Technology

基　　金：江西省自然科学基金项目(20151BAB206040);江西省教育厅科技项目(GJJ14722);华中科技大学模具国家重点实验室开放基金项目(P2014-019);九江学院科研项目(2015LGYB09)

摘　　要：挤扭（TE）是一种新型大塑性（SPD）变形工艺。采用体积可压缩刚粘塑性热力耦合有限元法对CuZnAl粉末体进行了热力耦合挤扭成形致密模拟。分析了挤扭成形致密工艺,探讨了其应力-应变场、温度场变化规律以及致密化行为。结果表明,挤扭工艺能产生较强静水压力,导致粉末多孔体材料致密化,但1道次TE的坯料横截面上各区域致密化呈不均匀性,需要多道次的挤扭成形或模具结构优化。Twist extrusion （TE） is a new type of severe plastic deformation （SPD） technology. The densification simulation ofthermo-mechanical coupling TE forming of CuZnA1 powders was carried out by using the volume compressible rigid viscoplastic finite element method. The densification process of TE forming was analyzed, and the stress-strain field, the variation of temperature field and the densification behavior were discussed. The results show that TE process can produce a strong hydrostatic pressure, which leads to densification of powder porous material. But regional densification of billet cross section of one pass TE is not uniform, which needs to multi-pass twist extrusion forming or die structure optimization.

关 键 词：CuZnAl粉末体 挤扭 热力耦合 静水压力 致密化 

分 类 号：TG376[金属学及工艺—金属压力加工]