Effect of Severe Plastic Deformation on the Characteristics of a PM Aluminum Alloy

被引：1

作者：

Grande, Marco Actis ^{[1
]}

Bidulsky, Robert ^{[1
]}

Bidulska, Jana ^{[2
]}

Kvackaj, Tibor ^{[2
]}

机构：

[1] Politecn Torino, Alessandria Campus,Viale T Michel 5, I-15121 Alessandria, Italy

[2] Tech Univ Kosice, Fac Met, Dept Metals Form, Kosice SK-04200, Slovakia

来源：

MANUFACTURING PROCESS TECHNOLOGY, PTS 1-5 | 2011年 / 189-193卷

关键词：

Powder Metallurgy; Aluminium Alloys; Sintering; ECAP; Porosity; CHANNEL ANGULAR EXTRUSION; BACK-PRESSURE;

D O I：

10.4028/www.scientific.net/AMR.189-193.2838

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The paper deals with the influence of severe plastic deformation on the typical powder metallurgy (PM) microstructural characteristics, such as porosity, of a PM aluminum alloy. A commercial ready-to-press aluminum based powder was used as material to be investigated. After applying different compacting pressures (400, 500, 600 and 700 MPa), specimens were debinded in a ventilated furnace at 400 degrees C for 60 min. Sintering was carried out in a vacuum furnace at 610 degrees C for 30 min. The specimens were ECAPed for 1 pass. The dimensional and morphological porosity of investigated materials were measured individually for each pore. Results show that ECAP generates shearing stress breaking down the oxide film; this, coupled to particles deformation under local constraints, enables strong bonding and stability. Therefore, ECAP supports next progressive decreasing of pore size as well as strongly influences both dimensional and morphological porosity characteristics, considering that small pores evolve easily to a circular form. Moreover, ECAP cause strong bonding between adjacent particles, which results in a significant increase of mechanical properties.

引用

页码：2838 / +

页数：2

共 12 条

[11] Principles of equal-channel angular pressing as a processing tool for grain refinement [J].

Valiev, Ruslan Z. ;

Langdon, Terence G. .

PROGRESS IN MATERIALS SCIENCE, 2006, 51 (07) :881-981

[12] Pure aluminum with different grain size distributions by consolidation of particles using equal-channel angular pressing with back pressure [J].

Wu, X. ;

Xu, W. ;

Xia, K. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 493 (1-2) :241-245

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