(1. 銅陵學院 機械工程學院，銅陵 244061；
2. 東北大學 軋制技術及連軋自動化國家重點實驗室，沈陽 110819)
摘 要: 采用具有拉拔?壓縮?剪切復合成形功能的微型異步軋機，對厚度方向具有單層和少層晶結構的銅極薄帶開展箔軋實驗。基于晶體塑性有限元理論，模擬分析復合軋制單層和少層晶銅極薄帶的塑性各向異性行為。將單層和少層晶銅極薄帶的初始織構和晶粒形貌輸入晶體塑性有限元模型，分析極薄帶軋制成形中晶粒層次的滑移啟動、定量應變演化以及變形局部化現(xiàn)象。同時，模擬分析單/多滑移系啟動、滑移局部化以及與微觀組織相關的變形演化。結果表明：軋制單層晶銅極薄帶的滑移區(qū)域和局部化趨勢主要依賴于晶粒形貌結構，晶體塑性有限元模型準確獲得滑移啟動及其滑移區(qū)域的演化。軋制少層晶銅極薄帶的滑移和塑性變形具有明顯的各向異性，且隨晶粒層數(shù)的減少而增強。同一晶粒內(nèi)部和相鄰晶粒的晶界局部區(qū)域存在顯著的滑移與變形差異，這為裂紋的萌生和缺陷的形成提供了有利的位置。
關鍵字: 單層晶；少層晶；極薄帶軋制；晶體塑性；各向異性
（1. School of Mechanical Engineering, Tongling University, Tongling 244061, China;
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China）
Abstract:The single layer and oligo-crystal copper were studied using foil rolling under the compound forming with tension, compression and shearing. The plastic anisotropy of single layer and oligo-crystal copper under foil rolling was characterized by meso-scale crystal plasticity-finite element (CPFE) simulations. The single layer and oligo-crystal copper initial texture, grain morphology (microstructures) were incorporated into crystal plasticity finite element models. The grain-by-grain comparisons of slip activation, quantify the developing strain fields and the deformation localization can be carried out to analyze the foil rolling forming process. The single and multiple slip activation, slip localization and microstructure-sensitive deformation evolution were examined. The slip fields and localization of single layer-crystal copper under foil rolling depending on crystallographic structure. Modelling correctly captures slip activation and the developing slip fields. The slip and plastic deformation of oligo-crystal copper under foil rolling are markedly anisotropy, with the grain layer decreases driving strong variations, also reasonably captured by the model. The remarkable variations occur in grain and between locations either side of grain boundaries, providing appropriate opportunities for crack nucleation.
Key words: single layer-crystal; oligo-crystal; foil rolling; crystal plasticity; anisotropy
