Structure of As-cast aluminum matrix composite containing Ni3AI-type intermetallic ribbons

Varin, R.A.; Metelnick, M.P.; Wroński, Z.

doi:10.1007/bf02647396

Cited by 10 publications

(11 citation statements)

References 12 publications

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“…As a consequence, the residual stresses generated at the matrix/reinforcement interface during high temperature exposure are much lower. Some of these composites have been processed from the melt in the past years, using nickel aluminides as reinforcement, and were shown to exhibit better ductility and wear properties than the equivalent materials reinforced with ceramic particles [10,11]. In the case of the nickel aluminides, however, reaction products were formed at the metal/intermetallic interface due to the high temperatures reached during processing.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of Al-TiAl composites with different intermetallic volume fractions and particle sizes

Muñoz-Morris¹,

Rexach²,

Lieblich³

2005

Intermetallics

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A new family of Al-matrix composites containing g-TiAl intermetallic reinforcement particles has been processed by extruding aluminium and TiAl powders in different proportions up to 50% of the intermetallic. To modify the size and distribution of the intermetallic powders they were used in three different states, namely, atomised, and milled for 1 and 5 h. The yield strengths of the composites are very dependent on the volume fraction of the reinforcement and follow a Hall-Petch type relationship on the interparticle spacing. Much of the strength of the composites is retained up to temperatures of 250 8C, with an activation energy responsible for the deformation process measured as QZ96G5 kJ/mol for all materials, indicating that the high temperature deformation is controlled by diffusion along dislocations in the aluminium matrix. The plastic ductility is also dependent on the volume fraction of particles but is not much affected by the particle state. The composites containing 25% particles have higher ductilities, ranging between 9 and 12% at all temperatures and for all particle states. q

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Section: Introductionmentioning

confidence: 99%

Comparative study of Al-TiAl composites with different intermetallic volume fractions and particle sizes

Muñoz-Morris¹,

Rexach²,

Lieblich³

2005

Intermetallics

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“…In melt spinning, the charge was induction melted in either quartz or yttria-coated quartz crucible and pressurized helium was used to eject the aluminide melt at 34.45 kPa out of a 1.1 mm diameter orifice. The Debye-Scherrer X-ray diffraction of fabricated ribbons showed patterns characteristic of a crystalline Ni 3AI intermetallic (30). However, it is worth noting, that on some occasions when the orifice diameter was lower than 0.9 mm, an amorphous phase diffraction pattern was observed.…”

Section: Microstructure Of a Compositementioning

confidence: 94%

“…Since the developmental stage of the fabrication of reinforcing ribbons with the compositions shown in Table 2 has not been completed yet we decided to fabricate ribbons with a slightly simpler composition corresponding to Ni 7SAl 23ZrB (at.%) (3)(4)30). The ribbons were rapidly solidified on a beryllium copper wheel using the free jet single-roller melt spinning technique in ultra-pure argon at a surface speed of 28 m/s (3)(4)30).…”

Section: Microstructure Of a Compositementioning

confidence: 99%

“…The ribbons were rapidly solidified on a beryllium copper wheel using the free jet single-roller melt spinning technique in ultra-pure argon at a surface speed of 28 m/s (3)(4)30). In melt spinning, the charge was induction melted in either quartz or yttria-coated quartz crucible and pressurized helium was used to eject the aluminide melt at 34.45 kPa out of a 1.1 mm diameter orifice.…”

Section: Microstructure Of a Compositementioning

confidence: 99%

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Metal Matrix Composites Reinforced With Intermetallic Ribbons

Varin

Wroński

Metelnick

1990

Materials and Manufacturing Processes

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The design procedure for low melting point alloy composites reinforced with melt-spun intermetallic ribbons for elevated temperature applications is presented. Long·range ordered Ni 3A1 intermetallic is selected as a candidate reinforcement by virtue of its ease of being ductilized by boron and an increase in yield strength with increasing temperature. A certain composition of Ni 3A1 alloyed with cobalt, tantalum, hafnium and boron for the maximum reinforcing effect is formulated. The rule of mixtures calculations of elastic modulus and yield strength are performed for AI-Si and Mg-AI matrices. The results of the structural investigation of a model composite system consisting of a tt 00 AI matrix with embedded Ni7SAl23Zr181 (a1.%) ribbons, obtained by casting, are presented. Lonq-terrn stability of the reinforcing ribbons is investigated by annealing of "as-cast" specimens at elevated temperatures up to 100 h.

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“…Al-based composites with intermetallics particles as reinforcement are attractive as structural materials since they combine the attractive mechanical properties of the matrix, such as ductility and toughness, with those of high modulus and strength of the intermetallics [10,11]. Also the intermetallic particles have an advantage over ceramics since their thermal expansion coefficients are much closer to that of the aluminium matrix than are those of ceramic reinforcements [12].…”

Section: Introductionmentioning

confidence: 98%

Effect of equal channel angular pressing on strength and ductility of Al–TiAl composites

Muñoz-Morris¹,

Gutiérrez-Urrutia²,

Morris³

2005

Materials Science and Engineering: A

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Structure of As-cast aluminum matrix composite containing Ni3AI-type intermetallic ribbons

Cited by 10 publications

References 12 publications

Comparative study of Al-TiAl composites with different intermetallic volume fractions and particle sizes

Comparative study of Al-TiAl composites with different intermetallic volume fractions and particle sizes

Metal Matrix Composites Reinforced With Intermetallic Ribbons

Effect of equal channel angular pressing on strength and ductility of Al–TiAl composites

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