Microstructure and Mechanical Properties of Cast Al-5Zn-2Mg Alloy Subjected to Equal-Channel Angular Pressing

被引：9
作者：
Manjunath, G. K. [1 ]
Kumar, G. V. Preetham [1 ]
Bhat, K. Udaya [1 ]
Huilgol, Prashant [1 ]
机构：
[1] Natl Inst Technol Karnataka, Dept Met & Mat Engn, Mangalore 575025, India
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 11期
关键词：
Al-Zn-Mg alloy; ECAP; grain refinement; mechanical properties; x-ray diffraction analysis; SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; ZN-MG ALLOYS; AL-ZN; TENSILE PROPERTIES; GRAIN-REFINEMENT; ECAP; EVOLUTION; BEHAVIOR; FRACTURE;
D O I：
10.1007/s11665-018-3691-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present work, cast Al-5Zn-2Mg alloy was processed through equal-channel angular pressing (ECAP) in route B-C up to four number of passes. Microstructure and mechanical properties were investigated on processed and unprocessed materials. In cast condition, the material was composed of dendritic structure. After homogenization treatment, large-sized grains were observed. After ECAP processing, significant grain refinement was observed. After ECAP processing, high-density dislocations and high degree of misorientation between the grains were observed. In cast material, rod-shaped precipitates were observed, while, after ECAP processing, spherical-shaped precipitates were observed. ECAP processing leads to a noticeable improvement in the mechanical properties of the material. After four passes, 122% improvement in the microhardness and 135% improvement in the ultimate tensile strength of the material were observed. After three passes, a slight decrease in the mechanical properties was observed. This is attributed to the dissolution of the metastable phase, annihilation of dislocations, dynamic recrystallization and texturing during ECAP processing. Brittle fracture mode was observed in tensile testing cast and homogenized samples. After ECAP processing, fracture mode was changed into shear fracture mode.
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收藏
页码：5644 / 5655
页数：12
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