Macro/microstructure evolution and mechanical properties of Ti33.3Al alloys by adding WC particles

Chen, Ruirun; Tan, Yingmei; Fang, Hongyuan; Luo, Liangshun; Ding, Hongsheng; Su, Yanqing; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.msea.2018.04.025

Cited by 11 publications

(5 citation statements)

References 42 publications

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“…The addition of carbon up to about 0.8 at.% contributes to precipitation strengthening through the formation of two types of fine carbides: cubic perovskite-type Ti 3 AlC (P-type) with needle-like morphology and hexagonal Ti 2 AlC (H-type) with plate-like morphology [ 12 , 14 , 15 , 16 ]. Higher content of carbon (above 1 at.%) leads to the formation of coarse primary H-type carbide particles during solidification [ 17 , 18 , 19 , 20 , 21 ]. The H-Ti 2 AlC is a thermodynamically stable phase with a unique combination of both metallic and ceramic properties such as high fracture resistance, excellent damage tolerance, good thermal and electrical conductivity, easy machinability, good thermal shock and oxidation resistance, high elastic modulus, and thermomechanical stability [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Microstructure and Mechanical Properties of Two TiAl-Based Alloys Reinforced with Carbide Particles

2020

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Microstructure and mechanical properties of two TiAl-based alloys with nominal composition Ti-42.6Al-8.7Nb-0.3Ta-2.0C and Ti-41.0Al-8.7Nb-0.3Ta-3.6C (in at.%) were investigated and compared. The alloys were prepared by vacuum induction melting, followed by centrifugal casting. The as-cast samples were subjected to hot isostatic pressing and heat treatment consisting of solution annealing in β (Ti-based solid solution) phase field, cooling at a constant rate and stabilization annealing. The microstructure of the alloys consists of α2 (Ti3Al) + γ (TiAl) lamellar grains, single γ phase, coarse Ti2AlC particles, and irregular shaped α2 phase. The increase in the content of C at the expense of decreasing Al in the studied alloys affects solid-state phase transformation temperatures and leads to a decrease in size of grains and primary Ti2AlC particles, increase in the volume fraction of reinforcing carbide particles, decrease in the volume fraction of lamellar colonies, and widening of the grain boundaries. Long-term ageing at 800 °C has no effect on the grain size but leads to the formation of Ti4Al3Nb particles and increase in interlamellar spacing. The Vickers hardness, microhardness of lamellar grains, indentation nanohardness, and elastic modulus of the boundary γ phase decrease during ageing. The Ti-42.6Al-8.7Nb-0.3Ta-2.0C alloy shows improved creep resistance compared to that of Ti-41.0Al-8.7Nb-0.3Ta-3.6C and some reference TiAl-based alloys at a temperature of 800 °C and applied stress of 200 MPa.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Microstructure and Mechanical Properties of Two TiAl-Based Alloys Reinforced with Carbide Particles

2020

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“…Compared with the compressive strength of the composite materials prepared by Shu et al [20] and Cheng et al [21], it is found that the maximum compressive strength of the (Ti 2 AlC + Al 2 O 3 ) p /TiAl composites prepared in this study under room-temperature compression testing (with the addition of 2 wt.% stearic acid) increase by 23% and 14%, respectively. Compared with the composite materials prepared by Chen et al [19] and Shu et al [20], the maximum fracture strain increased by 12% and 80%, respectively.…”

Section: Mechanical Properties Of (Ti 2 Alc + Al 2 O 3 )P/tial Compos...mentioning

confidence: 72%

“…As the amount of stearic acid added increases, the yield strength and maximum compressive strength of (Ti 2 AlC + Al 2 O 3 ) p /TiAl composites also increase. Based on the research of Chen et al [19] (Ti 2 AlC/TiAl composites with WC particles added), Shu et al [20] (Ti 2 AlC/TiAl composites with Nb-C added), and Cheng et al [21] (near-mesh Ti 2 AlC-reinforced TiAl matrix composites with nano-TiC powder added), it was found that the room-temperature compressive strength and fracture strain of the prepared Ti 2 AlC/TiAl composites increase with the increase of the content of additives as a carbon source (within a certain range). This indicates that Ti 2 AlC particles have a significant enhancing effect on the mechanical properties of TiAl matrix composites, which is consistent with the results of this study.…”

Section: Mechanical Properties Of (Ti 2 Alc + Al 2 O 3 )P/tial Compos...mentioning

confidence: 99%

“…When Ti 2 AlC particles are used to enhance TiAl matrix composites, they can effectively reduce the thermal residual stress between the reinforcing particles and the matrix, making it one of the ideal reinforcements for TiAl matrix composites. Chen et al [19] successfully prepared Ti 2 AlC-reinforced TiAl matrix composites and studied their fracture behavior. They found that the layered structure of Ti 2 AlC comprehensively improved the mechanical properties of the TiAl alloy.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites

Zhu,

Yuan,

Pei

et al. 2024

Metals

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A new type of multiphase nanoparticle-reinforced TiAl matrix composites ((Ti2AlC + Al2O3)p/TiAl composites) was successfully prepared by vacuum hot-pressing sintering using Ti powder and Al powder, which were ball-milled with different contents of stearic acid (CH3(CH2)16COOH). The component, microstructure, reaction mechanism, and mechanical properties were studied. The results indicated that the composites prepared by adding stearic acid as a process control agent during the ball-milling process not only contained γ-TiAl and α2-Ti3Al phases but also Ti2AlC and Al2O3 phases. The results of SEM and TEM showed that the composites were composed of equiaxed TiAl and Ti3Al grains, and the Ti2AlC and Al2O3 particles were mainly distributed along the TiAl grain boundary in chain form, which can effectively reduce the TiAl grain size. Through the room-temperature compression test, the maximum compression stress was significantly improved in those composites that added the stearic acid, due to the reinforcement particles. The maximum compression stress was 1590 MPa with a 24.3% fracture strain. In addition, the generated crack deflection and Ti2AlC and Al2O3 particles could also enhance the toughness of the TiAl alloy. (Ti2AlC + Al2O3)p/TiAl composites generated by adding stearic acid played a key role in improving the mechanical properties of the TiAl matrix.

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“…: +421 2 3240 1058; e-mail address: michaela.stamborska@savba.sk mary Ti 2 AlC particles directly from the melt during solidification [9][10][11]. Recent studies have shown that TiAl-based alloys reinforced with homogeneously distributed coarse carbide particles can be prepared by melting and casting techniques [10][11][12][13][14][15][16][17]. In spite of the previous studies, only very limited information is available about the room temperature compressive behaviour of high carbon containing TiAl-based alloys prepared by melting and casting.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon on the room temperature compressive behaviour of Ti-44.5Al-8Nb-0.8Mo-xC alloys prepared by vacuum induction melting

Stamborska¹,

Lapin²,

Bajana³

2018

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The effect of carbon content x ranging from 1.4 to 3.6 at.% on the room temperature compressive behaviour of Ti-44.5Al-8Nb-0.8Mo-xC (at.%) alloys prepared by vacuum induction melting has been studied. The microstructural analysis by SEM shows that the increase of the carbon content increases the volume fraction of the reinforcing carbide particles and leads to a change of the matrix microstructure from α2(Ti3Al) + γ(TiAl) + β/B2 to γ type. The carbon content affects the morphology and size of the primary plate-like, regular and irregular shaped Ti2AlC particles. The finite element analysis (FEA) of local equivalent strains and quantitative metallography analysis indicate that the mean size of fragmented carbide particles decreases with increasing local equivalent strain in the compression specimens. The differences in work hardening behaviour of the compression specimens with various content of carbon are related to the initial non-uniform deformation, cracking of primary carbide particles, crack propagation and release of some grains from the free surface during compression testing.

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Macro/microstructure evolution and mechanical properties of Ti33.3Al alloys by adding WC particles

Cited by 11 publications

References 42 publications

Comparative Study of Microstructure and Mechanical Properties of Two TiAl-Based Alloys Reinforced with Carbide Particles

Comparative Study of Microstructure and Mechanical Properties of Two TiAl-Based Alloys Reinforced with Carbide Particles

The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites

Effect of carbon on the room temperature compressive behaviour of Ti-44.5Al-8Nb-0.8Mo-xC alloys prepared by vacuum induction melting

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