Microstructural configuration and compressive deformation behavior of a TiAl composite reinforced by Mn and in situ Ti2AlC particles

Gao, Yunlei; Kou, Shuqing; Dai, Jun-Nan; Wang, Zhifa; Shu, Shili; Zhang, Shuang; Qiu, Feng; Jiang, Qi‐Chuan

doi:10.1016/j.msea.2021.141772

Cited by 45 publications

(10 citation statements)

References 51 publications

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“…Compared with the mixture of 2Ti/1.2Al/C, the ratio of 3Ti/ 1.5Al/C had two strong exothermic peaks at about 945 °C and 1100 °C, which corresponded to the synthetic reactions of TiC and Ti 2 AlC, respectively. e value of 3Ti/1.2Al/2C is bigger than that of Ti/1.2Al/2TiC in all ranges of 400 ∼1300 °C because both the formation of TiAl x [17][18][19][20]or TiC [21,22] is an exothermic reaction. Gao et al have systematically investigated the TiAl x generation process in the systems Ti-Al-C and Ti-Mn-Al-C and con rmed the composition of the phases at di erent temperature points and discuss the formation mechanism of TiAl x in Figure 5 of reference [20].…”

Section: Resultsmentioning

confidence: 86%

“…e value of 3Ti/1.2Al/2C is bigger than that of Ti/1.2Al/2TiC in all ranges of 400 ∼1300 °C because both the formation of TiAl x [17][18][19][20]or TiC [21,22] is an exothermic reaction. Gao et al have systematically investigated the TiAl x generation process in the systems Ti-Al-C and Ti-Mn-Al-C and con rmed the composition of the phases at di erent temperature points and discuss the formation mechanism of TiAl x in Figure 5 of reference [20]. Professor Yanchun Zhou et al showed that TiC x was formed at 950 °C by DSC analysis (Figure 1 of the reference [22]) which can be seen from XRD shown in Figure 2(d) of reference [22].…”

Section: Resultsmentioning

confidence: 86%

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The Influence of Sintering Pressure on the Preparation, Friction Properties, and Magnetic Properties of Ti2AlC-TiC and Ti3AlC2-TiC Composites Under High-Pressure and High-Temperature

Yuqi

2022

Advances in Materials Science and Engineering

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Due to their high melting point, low density, and affordable price, TiC ceramics have emerged as one of the most promising ultrahigh temperature structural materials. However, its development and usage are severely constrained by its weak mechanical characteristics. The Ti2AlC-TiC and Ti3AlC2-TiC composites were synthesized by using the laminated metal-ceramic Ti2AlC/Ti3AlC2 as the binder, combined with high-temperature and high-pressure sintering technology (GPa order of magnitude confinement system). The thermal analysis shows that the exothermic heat of Ti/1.2Al/2TiC is less than that of 3Ti/1.2Al/2C, 2Ti/1.2Al/C, and 3Ti/1.5Al/C. The ratio of Ti/1.2Al/2TiC can suppress the thermal explosion phenomenon during the sintering process and improve the safety of the high-pressure sintering process. XRD results showed that the main composition of the sintered products was Ti2AlC-TiC at 2∼3.5 GPa and Ti3AlC2-TiC at 4∼5 GPa. As the sintering pressure increased from 2 GPa to 5 GPa, the bonding phase changed from Ti2AlC to Ti3AlC2. The thickness of the synthetic Ti3AlC2 layer is near 0.1 µm under 5 GPa. The average friction coefficient of Ti2AlC-TiC composites sintered 2 GPa with POM is as low as 0.1767, while the average friction coefficient of Ti3AlC2-TiC composites with POM increased to 0.3468∼0.3797. The wear width of Ti2AlC-TiC is lower than that of Ti3AlC2-TiC composites sintered under 4–4.5 GPa. The wear width of Ti3AlC2-TiC composites decreases following the rise of sintering pressure and is reduced to 0.3504 mm under 5 GPa. Ti2AlC-TiC and Ti3AlC2-TiC composites with PP ball counterparts have friction coefficients of 0.375 to 0.45 and worse wear resistance than that of POM balls. Ti3AlC2-TiC composites synthesized at 5 GPa with a Cu ball had the smallest friction coefficient (0.4558) and the smallest wear scar width (0.6289 mm). The friction coefficients and wear widths of synthetics with Al pairs ranged from 0.48–0.697 and 0.851–1.087 mm, respectively, and varied irregularly with increasing sintering pressure. Ti2AlC-TiC composites synthesized at 2 GPa with agate and glass pairs have coefficients of friction of 0.5 and 0.61, respectively. Abrasion widths of Ti2AlC-TiC composites synthesized at 2 GPa with agate and glass pairs were 1.3 mm and 0.72 mm, respectively. The friction coefficient of synthetics with agate and glass pairs increases with increasing sintering pressure. The magnetization and magnetization intensity of the Ti3AlC2-TiC composites are stronger than those of Ti3AlC2. Ti2AlC-TiC and Ti3AlC2-TiC composites held promise to serve in the field of ceramic grinding processing applications.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 86%

The Influence of Sintering Pressure on the Preparation, Friction Properties, and Magnetic Properties of Ti2AlC-TiC and Ti3AlC2-TiC Composites Under High-Pressure and High-Temperature

Yuqi

2022

Advances in Materials Science and Engineering

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“…This phase has a length of about 300–400 nm and a width of about 80 nm. The Ti 2 Al phase has the same crystal structure and extremely similar crystal parameters as the Ti 2 AlN phase (P63/mmc, a = b = 2.985, c = 13.567) and the Ti 2 AlC phase (P63/mmc, a = b = 3.040, c = 13.600) [ 46 , 47 , 48 ]. He et al determined that the close-packed planes of the Ti 2 Al phase are the same as the α 2 phase and γ phase, the order of the close-packed planes is AB’CBC’BA, and the stacking period is three times that of α 2 and twice that of γ phase and inferred that the Ti 2 Al phase is the transient phase between the α 2 and γ phase.…”

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution of the Ti-46Al-8Nb-2.5V Alloy during Hot Compression and Subsequent Annealing at 900 °C

Cao,

Li,

et al. 2023

Materials

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TiAl alloys are high-temperature structural materials with excellent comprehensive properties, and their ideal service temperature range is about 700–950 °C. High-Nb containing the Ti-46Al-8Nb-2.5V alloy was subjected to hot compression and subsequent annealing at 900 °C. During hot compression, work-hardening and strain-softening occurred. The peak stresses during compression are positively correlated with the compressive strain rates and negatively correlated with the compression temperatures. The α2 phase exhibited a typical (0001)α2 basal plane texture after hot compression, while the β0 and γ phases did not show a typical strong texture. Subsequent annealing at 900 °C of the hot-compressed samples resulted in significant phase transformations, specifically the α2 → γ and β0 → γ phase transformations. After 30 min of annealing, the volume fraction of the α2 phase decreased from 39.0% to 4.6%. The microstructure characteristics and phase fraction after 60 min of annealing were similar to those after 30 min. According to the calculation of Miller indexes and texture evolution during annealing, the α2 → γ phase transformation did not follow the Blackburn orientation relationship. Multiple crystal-oriented α2 phases with nanoscale widths (20~100 nm) precipitate within the γ phase during the annealing process, which means the occurrence of γ → α2 phase transformation. Still, the γ → α2 phase transformation follows the Blackburn orientation relationship.

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“…Through relevant research reports (TiAl alloys and single-phase reinforced TiAl matrix composites), as shown in Figure 13a, it was found that although the compressive strength of Ti 2 AlC/TiAl composites [38][39][40][41][42] (except for 0.5 wt.% Ti 2 AlC/Ti48Al2Nb [23] and 5 wt.% Ti 2 AlC/TiAl (Nb-C) [20] in Figure 13a) was higher than that of this work, their fracture strains were all less than 0.2, indicating no significant improvement in toughness. Compared to Ti 2 AlC/TiAl composites, the compressive strength and fracture strain of Al 2 O 3 /TiAl composites [30] are almost smaller.…”

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

confidence: 99%

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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Microstructural configuration and compressive deformation behavior of a TiAl composite reinforced by Mn and in situ Ti2AlC particles

Cited by 45 publications

References 51 publications

The Influence of Sintering Pressure on the Preparation, Friction Properties, and Magnetic Properties of Ti2AlC-TiC and Ti3AlC2-TiC Composites Under High-Pressure and High-Temperature

The Influence of Sintering Pressure on the Preparation, Friction Properties, and Magnetic Properties of Ti2AlC-TiC and Ti3AlC2-TiC Composites Under High-Pressure and High-Temperature

Microstructure Evolution of the Ti-46Al-8Nb-2.5V Alloy during Hot Compression and Subsequent Annealing at 900 °C

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

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