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

Muñoz-Morris, Ma Antonia; Gutiérrez-Urrutia, I.; Morris, David G.

doi:10.1016/j.msea.2004.11.046

Cited by 25 publications

(10 citation statements)

References 15 publications

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“…Coarse hard particles have been found to be effective in promoting grain refinement [18][19][20][21][22][23][24] during ECAP. However, metals and alloys containing hard particles are prone to cracking during ECAP due to particle breaking-up and void formation around particles, which limits the deformability at room temperature (RT) [25].…”

Section: Deformation Microstructures After Ecapmentioning

confidence: 99%

Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP

Jia

Bjørge

Marthinsen

et al. 2017

Materials Science and Engineering: A

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With the aim to improve the strength of potential Pb-free Al-Bi based bearing alloys, an Al-6Bi-8Zn alloy was subjected to equal channel angular pressing (ECAP). To reveal the roles played by the soft Bi particles, an Al-8Zn alloy is compared. After five passes of ECAP (5P), ultrafine grained (UFG) microstructures are obtained in both alloys, while most of the Bi particles are deformed into the flake shapes. The yield strength (YS) of the as-deformed Al-6Bi-8Zn sample is more than three times as that of the as-cast sample. The influence of soft Bi particles on the deformation during ECAP and the final mechanical properties of the Al-6Bi-8Zn alloy are discussed.It is revealed that soft Bi particles have a strong influence on enhancing grain refinement during ECAP. At the same time, ECAP is found to accelerate the precipitation of the β(Zn) phase along grain boundaries (GBs).

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Section: Deformation Microstructures After Ecapmentioning

confidence: 99%

Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP

Jia

Bjørge

Marthinsen

et al. 2017

Materials Science and Engineering: A

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“…Al-based composites reinforced with TiAl intermetallic particles have been processed with ECAP and the evolving microstructure and the mechanical properties were compared to the composite in the as extruded state. 127,128 Due to ECAP processing, the grain size in the composite is refined (500-750 nm depending on ECAP route) and up to a 75% increase in the yield strength is obtained. The enhancement of strength is attributed to the grain size refinement as well to mobile dislocations inside the grains produced by ECAP.…”

Section: Miscellaneous Materialsmentioning

confidence: 99%

“…7). Another example is the unchanged TiAl particle size in an Albased composite deformed with ECAP using routes A and C. 127,128 In ARB processed composites, the undeformability of particles and therefore unchanged and a large particle size is also often reported. Al 2 O 3 particles with a size of y50 mm in an Al matrix maintained their size during the ARB process even tough the matrix grain size was refined.…”

Section: Metal Matrix Composites Reinforced With Carbon-based Particlesmentioning

confidence: 99%

Generation of metallic nanocomposites by severe plastic deformation

Bachmaier

Pippan

2013

International Materials Reviews

118

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In this article, the potential to fabricate composites with ultrafine grained structures, as well as composites with a nanostructure, by different severe plastic deformation methods, is reviewed. A broad spectrum of diverse composites produced by severe plastic deformation methods exist which include metal-metal composites, metal matrix composites and amorphous metal matrix composites. Furthermore, the influence of the strain path and initial structure on the final composite material is outlined.

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“…It indicates that massive dislocation annihilations and rearrangement have occurred during ECAP deformation. As can be seen from STEM images in Figure 3e,f, a large amount of nano-sized Zn particles distributed mainly along HABs have formed in both alloys as a result of dynamic precipitation [20]. The average size and number density of Zn particles are 80 nm and 5 × 10 12 m −2 in the 5P Al-6Bi-8Zn alloy, which are larger than that of the 5P Al-8Zn alloy (the average size and number density of Zn particles are 40 nm and 3 × 10 12 m −2 , respectively).…”

Section: Resultsmentioning

confidence: 85%

Thermal Stability and Mechanical Properties of Al-Zn and Al-Bi-Zn Alloys Deformed by ECAP

Jia

Piao

Zhu

et al. 2021

Metals

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It is well known that ultrafine grained and nanocrystalline materials show enhanced strength, while they are susceptible to thermally induced grain coarsening. The present work aims to enhance the thermal stability of ultrafine Al grains produced by equal channel angular pressing (ECAP) via dynamically precipitation. Detailed characterization by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) has been carried out to reveal the microstructural evolution during both ECAP and post-ECAP annealing. After five passes of ECAP, both Al-8Zn and Al-6Bi-8Zn alloys show an ultrafine grain structure together with dynamic precipitated nanoscale Zn particles along grain boundaries. Upon annealing at 200 °C, ultrafine grains in the Al-8Zn and Al-6Bi-8Zn alloys show a remarkable thermal stability compared to the Al-8Bi alloy, which is mainly due to the presence of nanoscale Zn precipitates along grain boundaries. The present work reveals that nanoscale Zn particles have a positive effect on preserving the ultrafine grains during annealing, which is useful for the design of UFG Al alloys with improved thermal stability.

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

Cited by 25 publications

References 15 publications

Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP

Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP

Generation of metallic nanocomposites by severe plastic deformation

Thermal Stability and Mechanical Properties of Al-Zn and Al-Bi-Zn Alloys Deformed by ECAP

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