Microstructure and Tensile Behavior of Al7075/Al Composites Consolidated from Machining Chips Using HPT

A Way of Solid-State Recycling

Mohammad Khajouei-Nezhad, Mohammad Hossein Paydar, Majid Mokarizadeh Haghighi Shirazi, J. Gubicza

Research output: Contribution to journalArticle

Abstract

Abstract: In this study the feasibility of using high-pressure torsion (HPT) process as a suitable technique for solid-state recycling of Al alloy machining chips has been evaluated. One and four turns of HPT were used for consolidation of 7075 Al alloy chips/commercially pure Al powder mixtures at room temperature. The prepared mixtures included different weight fraction of chips in the range from 20 to 100%. The samples were fabricated from either annealed or non-annealed chips. Additionally, the effect of the fraction of 7075 Al chips on the density, microstructure and tensile behavior of the consolidated samples was investigated. It was found that the addition of pure aluminum powder played an important role as a binder in the consolidation process and yielded improved mechanical properties due to creating lower porosity and better bonding between the chips. Tensile tests revealed that the highest ultimate tensile strength and fracture strain were obtained for the composite containing near 50 wt% annealed 7075 Al chips, and fabricated through 4 turns of HPT. Optical microscopy investigations demonstrated that these conditions resulted in a fine microstructure with uniform distribution of chips. Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
JournalMetals and Materials International
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

recycling
Aluminum
machining
Torsional stress
torsion
Recycling
Machining
chips
solid state
aluminum
Consolidation
Powders
microstructure
Microstructure
composite materials
Composite materials
Optical microscopy
Binders
consolidation
Tensile strength

Keywords

  • Aluminum
  • Cold consolidation
  • Elongation to failure
  • High-pressure torsion (HPT)
  • Solid-state recycling
  • Ultimate tensile strength

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Microstructure and Tensile Behavior of Al7075/Al Composites Consolidated from Machining Chips Using HPT : A Way of Solid-State Recycling. / Khajouei-Nezhad, Mohammad; Paydar, Mohammad Hossein; Mokarizadeh Haghighi Shirazi, Majid; Gubicza, J.

In: Metals and Materials International, 01.01.2019.

Research output: Contribution to journalArticle

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AB - Abstract: In this study the feasibility of using high-pressure torsion (HPT) process as a suitable technique for solid-state recycling of Al alloy machining chips has been evaluated. One and four turns of HPT were used for consolidation of 7075 Al alloy chips/commercially pure Al powder mixtures at room temperature. The prepared mixtures included different weight fraction of chips in the range from 20 to 100%. The samples were fabricated from either annealed or non-annealed chips. Additionally, the effect of the fraction of 7075 Al chips on the density, microstructure and tensile behavior of the consolidated samples was investigated. It was found that the addition of pure aluminum powder played an important role as a binder in the consolidation process and yielded improved mechanical properties due to creating lower porosity and better bonding between the chips. Tensile tests revealed that the highest ultimate tensile strength and fracture strain were obtained for the composite containing near 50 wt% annealed 7075 Al chips, and fabricated through 4 turns of HPT. Optical microscopy investigations demonstrated that these conditions resulted in a fine microstructure with uniform distribution of chips. Graphic Abstract: [Figure not available: see fulltext.].

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