Microstructural and mechanical comparison of Ti+15%TiCp composites prepared by free sintering, HIP and extrusion

Fruhauf, Jean-Baptiste; Roger, Jérôme; Dezellus, Olivier; Gourdet, Sophie; Karnatak, N.; Peillon, Nathalie; Saunier, Sébastien; Montheillet, F.; Desrayaud, Christophe

doi:10.1016/j.msea.2012.05.096

Cited by 39 publications

(13 citation statements)

References 28 publications

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“…The Ti-15vol.%TiC (16.1wt.%) composite was synthesized from commercial TiC and Ti powders (see Tables 1 for their compositions) by the classical powder metallurgy route with a two-step procedure: high energy ball milling of the two starting materials (Ti and TiC powders) followed by extrusion of the ball-milled material after degassing and heat treatment for 1h at 920°C. More details on the experimental procedure, including the relative densities of materials, have already been reported [10]. Additional heat treatments at 920°C, both for longer and shorter heating times, were also performed.…”

Section: Synthesis Of Samplesmentioning

confidence: 99%

“…Additional heat treatments at 920°C, both for longer and shorter heating times, were also performed. For long dwell times, from 2 to 450h, the extruded Ti-TiC composite (relative density higher than 99% [10]) was used as a starting material and the treatment was performed in a classical radiant furnace under purified Ar atmosphere in an alumina boat with a Ti getter in order to lower the oxygen partial pressure. For the shorter heat treatment time (from 1.5 to 20 minutes), dedicated small cylinders of powder compacts (7 mm diameter and 2 mm height) were prepared by cold unidirectional pressing with a typical load of 1200 MPa in a tungsten carbide (WC) matrix (relative density of about 80%).…”

Section: Synthesis Of Samplesmentioning

confidence: 99%

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Synthesis of Ti matrix composites reinforced with TiC particles: thermodynamic equilibrium and change in microstructure

et al. 2016

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International audienceThe evolution of TiC reinforcement during the high-temperature consolidation step of a particulate-reinforced Ti matrix composite has been studied. A four-step scenario has been highlighted starting with the dissolution of the smallest particles to reach C saturation of the Ti matrix, followed by a change in the TiC stoichiometry from the initial TiC 0.96 composition to the equilibrium composition (TiC 0.57). This change in composition induces an increase in both the total mass fraction of reinforcement and the particle diameter. The diameter increase promotes contact between individual particles in the most reinforced domains and initiates an aggregation phenomenon that is responsible for the observed high growth rate of particles for heat treatment times shorter than 1h. Finally Ostwald ripening is responsible for the growth of particles for longer heat treatment times. 1. Introduction In the general context of structural lightening in the aerospace industry, Metal Matrix Composites (MMC) materials have attracted much interest over the past decades because of their high specific mechanical properties (relative to density) compared to existing metallic alloys. Of the fibers or particulate materials used as reinforcement for Ti-based composites, titanium carbide (TiC) has been widely investigated because of its excellent chemical compatibility with the matrix alloys [1–3]. Ti-TiC composites can be prepared by different routes although the most widely used is the classical powder metallurgy route [4, 5]. The nature of bonding at the matrix-reinforcement interface and the existence and extent of any reaction zone determine, to a large extent, the properties of the composite material. From the binary TiC phase diagram (see Figure 1-[6]), the expected interaction between a Ti-based matrix and commercial stoichiometric TiC particles, consists of the formation of a sub-stoichiometric form of the carbide according to reaction (1)

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Section: Synthesis Of Samplesmentioning

confidence: 99%

Section: Synthesis Of Samplesmentioning

confidence: 99%

Synthesis of Ti matrix composites reinforced with TiC particles: thermodynamic equilibrium and change in microstructure

et al. 2016

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“…[73,67] In addition, CP Ti/TiC composites produced by ex situ approach usually show inferior tensile properties to in situ fabricated. [87]…”

Section: Ti/tic Composites From Nanostructured C Precursorsmentioning

confidence: 99%

Recent Advances in the Design and Fabrication of Strong and Ductile (Tensile) Titanium Metal Matrix Composites

et al. 2019

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Titanium metal matrix composites (TiMMCs) offer much improved strength, elastic modulus, and wear resistance at both room and elevated temperatures but often at the expense of tensile ductility, which excludes them from most key engineering applications. Recent advances show that this long-standing strength-ductility dilemma can be controlled to a large extent by adopting novel design concepts based on powder metallurgy (PM). These include: 1) reinforcing the Ti matrix with a three-dimensional (3D) network-like architecture of TiB whiskers or nanowires; 2) the use of nanostructured carbon precursors (nanotubes, fibers, and graphene) to enable in situ formation of TiC reinforcements; and 3) the exploitation of "ductility-detrimental" interstitial elements (O, N, H) for strengthening. On a laboratory scale, the fabricated TiMMCs all exhibit an excellent combination of tensile strength and elongation, comparable to, or even better than, solution-treated and aged (STA) wrought Ti-6Al-4V. The mechanisms behind these novel developments are analyzed. New insights into the design and fabrication of stronger and more ductile (tensile) TiMMCs are offered.

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“…For example, TMCs with 10 wt% TiC (sintered at 1230°C) show superior mechanical properties compared to the monolithic PM Ti-64 alloy as shown in Table 16.1. However, it has been reported that pure titanium and TiC are not stable at high temperatures; for example, TiC 1-x layers form around TiC particles during sintering of the elementally blended Ti-TiC powders at 1375°C [22]. However, it has been reported that pure titanium and TiC are not stable at high temperatures; for example, TiC 1-x layers form around TiC particles during sintering of the elementally blended Ti-TiC powders at 1375°C [22].…”

Section: Ex Situ Processingmentioning

confidence: 99%

Titanium metal matrix composites by powder metallurgy (PM) routes

Kondoh

2015

Titanium Powder Metallurgy

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Microstructural and mechanical comparison of Ti+15%TiCp composites prepared by free sintering, HIP and extrusion

Cited by 39 publications

References 28 publications

Synthesis of Ti matrix composites reinforced with TiC particles: thermodynamic equilibrium and change in microstructure

Synthesis of Ti matrix composites reinforced with TiC particles: thermodynamic equilibrium and change in microstructure

Recent Advances in the Design and Fabrication of Strong and Ductile (Tensile) Titanium Metal Matrix Composites

Titanium metal matrix composites by powder metallurgy (PM) routes

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