Microstructure Evolution of 7075 Aluminum Alloy by Rotary

被引：1
|
作者：
Cao, Hui [1 ]
Yang, Yongbiao [1 ]
Zhang, Xing [1 ]
Ma, Jin [1 ]
Zhang, Tingyan [1 ]
Zhang, Zhimin [1 ]
机构：
[1] North Univ China, Coll Mat Sci & Engn, 3 Xueyuan Rd, Taiyuan 030051, Peoples R China
来源：
MATERIALS | 2022年 / 15卷 / 04期
关键词：
7075 Al alloy; rotary backward extrusion; conventional backward extrusion; TRANSITIONAL REGION; MAGNESIUM; BEHAVIOR; RECRYSTALLIZATION; DEFORMATION; EXTRUSION; CORROSION; COMPONENT;
D O I：
10.3390/ma15041445
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 degrees 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.
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页数：14
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