(合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009)
摘 要: 運用有限元模擬軟件Msc.Marc對純銅擠扭工藝變形特征進(jìn)行研究，分析擠扭變形過程中應(yīng)變分布以及應(yīng)變分量的變化趨勢。采用自行設(shè)計的擠扭模具，在室溫下進(jìn)行了純銅的一道次擠扭試驗。結(jié)果表明：變形可分為變形開始、完全充滿、逐步擠出3個階段；應(yīng)變呈中心低、邊緣高的分布；變形過程中正應(yīng)變分量小，切應(yīng)變分量較大，變形以剪切變形為主。擠扭過程中存在滑移和孿生兩種變形方式；擠扭后試樣的硬度得到顯著提高，在橫截面呈現(xiàn)邊緣高、中心低的分布趨勢。
關(guān)鍵字: 純銅；擠扭變形；數(shù)值模擬；顯微組織；顯微硬度
pure copper by twist extrusion
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The finite element simulation about pure copper deformation during twist extrusion (TE) was carried out by the simulation software MSC.Marc, the procedure steps of TE, the distribution of effective strain and the change of strain component were analyzed. The experiment about pure copper at room temperature during TE was carried out using this own die. The results show that the TE deformation can be divided into there steps. The value of the effective strain in the edge area is much larger than that of the center area. The value of the normal strain is extraordinary small, while the shear strain is relative large. There are slipping and twining during the TE process. The hardness of sample significantly increase, the hardness in the edge area is visibly larger than that in the center.
Key words: pure Cu; twist extrusion deformation; numerical simulation; microstructure; microhardness
