Titanium-Based Composites Produced by Powder Metallurgy

Wanjara, P.; Yue, Steve; Drew, R. A. L.; Root, J.H.; Donaberger, R. L.

doi:10.4028/www.scientific.net/kem.127-131.415

Cited by 32 publications

(21 citation statements)

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“…Titanium-based metal-matrix composites (TMCs) attract extensive attention owing to their high specific modulus, high specific strength, high strength at elevated temperature and wide potential application in the field of aviation, aerospace and automobile. Traditionally, TMCs have been produced by the processing techniques such as powder metallurgy 1) and casting technologies, 2,3) where the ceramic particles are directly incorporated into solid or liquid matrices, respectively. In recent years, novel processing techniques based on the in situ production of TMCs have emerged.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of in situ Synthesized Titanium Matrix Composites at Elevated Temperature

et al. 2003

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TiB and TiC reinforced titanium matrix composites were produced by common casting technique utilizing the self-propagation hightemperature synthesis between titanium and B 4 C. The mechanical properties and fracture mechanism of in situ synthesized titanium matrix composites have been investigated by means of uniaxial tension at elevated temperatures. As temperature increases, the ultimate tensile strength decreases and ductility increases. Compared with the matrix alloy, ultimate tensile strength of the composite was improved obviously because the in situ synthesized reinforcements are very stable at elevated temperatures and can strengthen the matrix alloy effectively. The fracture behavior was dependent on temperature. The composites fail at low strain at room temperature due to the fracture of the reinforcements. As temperature increases, voids are likely to initiate and grow at the interface between the reinforcement and the matrix alloy, and their coalescence eventually leads to the fracture of the composites. The debonding between the reinforcements and the matrix alloy becomes the main reason for the composites failure.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of in situ Synthesized Titanium Matrix Composites at Elevated Temperature

et al. 2003

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“…(6) it can be observed that there are nearly no obvious distinctions of steady state creep rate between the matrix alloy and the composite under an effective constant stress at 600 C and 650 C, though load transfer was observed by SEM at 600 C. Actually, the values of calculated according to eqs. (6) and (7) at 650 C and 700 C are respectively 0.0004 and 0.005. The values are so small that load transfer cannot be considered as the main strengthening origin.…”

Section: Threshold Stress Of the Compositementioning

confidence: 99%

“…Now in situ technologies has been used to synthesize TMCs with better mechanical properties than traditional processing methods, because the reinforcements are fine and thermodynamically stable, and the matrix-reinforcement interfaces are less polluted and better compatible. [4][5][6][7] In this work, 2% (volume fraction) TiB and TiC (mole ratio 1 : 1) reinforced TMC was synthesized by in situ technologies to improve high-temperature properties of 7715D Ti alloys based on the reaction among titanium, its alloyed elements, B 4 C powder and graphite powder as following equations:…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of In Situ Synthesized 7715D Titanium Matrix Composite

et al. 2009

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TiB and TiC reinforced titanium matrix composite was in situ synthesized by consumable vacuum arc remelting and hot-forging based on reaction between titanium, B 4 C powder and graphite powder. The phases were analyzed through X-ray diffraction. The microstructure was examined by means of optical microscopy (OM) and scanning electron microscopy (SEM). Creep behavior was tested at three temperatures: 600 C, 650 C and 700 C respectively within a stress range 100$350 MPa. Class I solution behavior was observed and true stress exponent n ¼ 3:5 was obtained for the composite. Threshold stress, load transfer and micro-structural strengthening are considered for reasonably explaining the creep behaviour. It is concluded that strengthening mechanism can be owed to co-effect of all the three factors. True activation energy equal to 343 kJ/mol was obtained after compensation by threshold stress.

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“…Metallic materials, alloys, ceramics, cermets and composites can be manufactured using PM technologies [8]- [11]. PM techniques would be viable solutions with lower processing cost and ease of production.…”

Section: Introductionmentioning

confidence: 99%

Sintering and Mechanical Properties of Titanium Composites Reinforced Nano Sized Al2O3 Particles

Gülsoy¹,

Pazarlıoğlu²,

Özbey³

et al. 2015

IJMMM

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Abstract-This study aims to compare the effect of Al 2 O 3 nano-particle additions on the densification, mechanical and electrochemical properties of Titanium (Ti) matrix composites. The Ti and Al 2 O 3 nano-particles were dry mixed and molded using by traditional Powder Metallurgy (PM) techniques. After the molded process, the samples were sintered at 1200º C and 1300º C for 60 min. under high level vacuum. Mechanical property, microstructural characterization and electrochemical property of the sintered samples were performed using tensile testing, hardness, optical, scanning electron microscopy and electrochemical corrosion experiments. All the powders, fracture surfaces of sintered samples were examined using scanning electron microscope. The sintered density of straight as well as Al 2 O 3 nano-particles reinforced Ti matrix composites increases with the increase in sintering time. The additions of Al 2 O 3 nano-particles improve the hardness values and corrosion behavior with the increase of sintering time.

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Titanium-Based Composites Produced by Powder Metallurgy

Cited by 32 publications

References 0 publications

Mechanical Properties of <I>in situ</I> Synthesized Titanium Matrix Composites at Elevated Temperature

Mechanical Properties of <I>in situ</I> Synthesized Titanium Matrix Composites at Elevated Temperature

Creep Behavior of <I>In Situ</I> Synthesized 7715D Titanium Matrix Composite

Sintering and Mechanical Properties of Titanium Composites Reinforced Nano Sized Al2O3 Particles

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