7075铝合金旋转加工的微观组织演变

Microstructure Evolution of 7075 Aluminum Alloy by Rotary.

作者信息

Cao Hui, Yang Yongbiao, Zhang Xing, Ma Jin, Zhang Tingyan, Zhang Zhimin

机构信息

College of Materials Science and Engineering, North University of China, 3 Xueyuan Road, Taiyuan 030051, China.

出版信息

Materials (Basel). 2022 Feb 15;15(4):1445. doi: 10.3390/ma15041445.

DOI:10.3390/ma15041445

PMID:35207986

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8874457/

Abstract

This study proposed a rotary back extrusion (RBE) process for an open punch, which is used to produce high-performance 7075 aluminum alloy cup-shaped piece. The RBE experiment was carried out on the Gleeble-3500 testing machine at 400 °C and compared with the conventional back extrusion (CBE). The microstructure was analyzed by optical microscope, scanning electron microscope and DEFORM-3D simulation software. The results shown that compared with CBE, RBE can significantly increase the equivalent strain value and deformation uniformity of 7075 aluminum alloy cup-shape pieces. RBE deformation increases the accumulated strain of the piece, and the rotation of the die causes the piece to produce shear strain, which increases the overall strain of the cup-shape piece. The proportion of dynamic recrystallization increases, and the grain refinement was obvious. The micro-hardness value of the RBE sample is higher than that of the CBE sample, which could be the result of grain refinement strengthening. What is more, RBE and CBE have different metal flow laws.

摘要

本研究提出了一种用于开式冲头的旋转反挤压（RBE）工艺，该工艺用于生产高性能7075铝合金杯形件。RBE实验在Gleeble-3500试验机上于400℃进行，并与传统反挤压（CBE）进行比较。通过光学显微镜、扫描电子显微镜和DEFORM-3D模拟软件对微观结构进行了分析。结果表明，与CBE相比，RBE可显著提高7075铝合金杯形件的等效应变值和变形均匀性。RBE变形增加了工件的累积应变，模具的旋转使工件产生剪切应变，从而增加了杯形件的整体应变。动态再结晶比例增加，晶粒细化明显。RBE样品的显微硬度值高于CBE样品，这可能是晶粒细化强化的结果。此外，RBE和CBE具有不同的金属流动规律。