Abstract
Interfacial reactions were investigated for a novel P/M (powder metallurgy) 5056 aluminium alloy metal matrix composite reinforced with particulate intermetallic Ni3Al. Composites were fabricated by extrusion of a blend of matrix alloy powder and intermetallic particles produced by self-propagating high temperature synthesis. Extrusion of 5056/15 vol.% Ni3Al at 400 °C produced bars of excellent quality, whereas extrusion of 5056/15 vol.% Ni3Al at 420 °C and of 5056/25 vol.% Ni3Al at 380 °C resulted in severe interfacial reactions and volume expansion during extrusion. The same reactions occurred in the good quality composite during subsequent heat treatment at 500 and 520 °C. The 5056 Al alloy with its high (~5 %) Mg content exhibited a higher reactivity with Ni3Al than Al alloys with low Mg content. The interfacial reaction products were identified to be Al3Ni and Al3Ni2. The interfacial reactions consumed Al so raising the Mg content of the residual matrix. This gave the possibility for the matrix to become partially molten at lower temperatures than expected from its nominal composition. Segregation of Mg near the reinforcement particles is accelerated by the presence of a high dislocation density in the matrix generated during extrusion.
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Financial contribution of the European Commission (project “COSTE-MAT”, BE 97–4445) is gratefully acknowledged.
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© 2001 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- In memoriam
- The Ringberg Workshop 1999 on Thermodynamic Modelling and Applications
- Aufsätze/Articles
- Using Ab Initio Calculations in the Calphad Environment
- Contributions to the Thermodynamic Modelling of Solutions
- Thermodynamic Modelling of Oxide and Oxynitride Phases
- The Modelling of Carbide, Nitride and Carbo-Nitride Phases
- Amorphous Phases in Materials Microstructure
- Experimental and Theoretical Study of the Al-Rich Corner in the Ternary Al–Ti–B System and Reassessment of the Al-Rich Side of the Binary Al–B Phase Diagram
- Evaluation of Superplastic Formability of the AZ31 Magnesium Alloy
- Characteristics of Mechanical Alloying of Zn–Al-Based Alloys
- The Effect of Sputter Cleaning and TiN Coating after Sputter Cleaning on Tensile and Fatigue Behavior of a Nodular Cast Iron
- Nucleation of Iron Nitrides during Gaseous Nitriding of Iron; Effect of a Preoxidation Treatment
- Structure Formation of Activated Nickel Catalyst During Caustic Leaching of a Nickel–Aluminium Alloy
- Experimental Study on the Electrical Conductivity and Thermo-Electromotive Force of Liquid Pb–Mg-Based Alloys
- Interfacial Reactions between the Aluminium Alloy Matrix and Intermetallic Reinforcement Particles in Novel P/M 5056/Ni3Alp Composites
- Microstructure and Devitrification Behavior of Melt-Spun Al-Rich Metallic Glasses and Nanostructured Composites
- Mitteilungen/Notifications
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences
Articles in the same Issue
- Frontmatter
- Editorial
- In memoriam
- The Ringberg Workshop 1999 on Thermodynamic Modelling and Applications
- Aufsätze/Articles
- Using Ab Initio Calculations in the Calphad Environment
- Contributions to the Thermodynamic Modelling of Solutions
- Thermodynamic Modelling of Oxide and Oxynitride Phases
- The Modelling of Carbide, Nitride and Carbo-Nitride Phases
- Amorphous Phases in Materials Microstructure
- Experimental and Theoretical Study of the Al-Rich Corner in the Ternary Al–Ti–B System and Reassessment of the Al-Rich Side of the Binary Al–B Phase Diagram
- Evaluation of Superplastic Formability of the AZ31 Magnesium Alloy
- Characteristics of Mechanical Alloying of Zn–Al-Based Alloys
- The Effect of Sputter Cleaning and TiN Coating after Sputter Cleaning on Tensile and Fatigue Behavior of a Nodular Cast Iron
- Nucleation of Iron Nitrides during Gaseous Nitriding of Iron; Effect of a Preoxidation Treatment
- Structure Formation of Activated Nickel Catalyst During Caustic Leaching of a Nickel–Aluminium Alloy
- Experimental Study on the Electrical Conductivity and Thermo-Electromotive Force of Liquid Pb–Mg-Based Alloys
- Interfacial Reactions between the Aluminium Alloy Matrix and Intermetallic Reinforcement Particles in Novel P/M 5056/Ni3Alp Composites
- Microstructure and Devitrification Behavior of Melt-Spun Al-Rich Metallic Glasses and Nanostructured Composites
- Mitteilungen/Notifications
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences