Strengthening Ti₃AlC₂ by In Situ Synthesizing Ti₃AlC₂–Y₄Al₂O₉ Composites

Abstract

Ti 3 AlC 2 has low density, high elastic modulus, quasi-ductility, and excellent oxidation resistance. However, its relatively low strength needs to be improved. In this study, dense Ti 3 AlC 2 -Y 4 Al 2 O 9 composites (containing 2.5, 5, and 7.5 wt% Y 4 Al 2 O 9 ) were synthesized by hot pressing/solid-liquid reaction using Ti, Al, C, and Y 2 O 3 as initial materials. We investigated the in situ formation process of Y 4 Al 2 O 9 , and studied the change of microstructure and optimization of mechanical properties of the Ti 3 AlC 2 -Y 4 Al 2 O 9 composites. The grain size and aspect ratio of Ti 3 AlC 2 grains are significantly reduced in Ti 3 AlC 2 -Y 4 Al 2 O 9 composites, which is the source of higher strength from room temperature to elevated temperatures. The Ti 3 AlC 2 -5 wt%Y 4 Al 2 O 9 composite shows better optimization in its mechanical properties than other studied composites. In addition, there is an improvement in strength without debit in toughness of the composite.T. Parthasarathy-contributing editor Manuscript No. 30482.

Effects of Grain Grading on Microstructures and Mechanical Behaviors of Pressureless Solid‐State‐Sintered SiC

“…Specially, a phase transformation of 6H to 4H also stimulated the excessive growth for S-SiC ceramics. 24 This can be illustrated by the fact that Sample C0-F100 contained more 4H phase than Sample C50-F50 and raw fine/coarse powders, as shown in Fig. 7b.…”

Fabrication of Nonwetting Flexible Free‐Standing MXene‐Carbon Fabric for Electromagnetic Shielding in S‐Band Region

“…In addition, MXene‐coated fabric exhibited some sharp peaks revealed the presence of crystalline structure. The Ti 3 AlC 2 displayed sharp 2θ peaks at 9.54°, 19.53°, 34°, 35.1°, 36.8°, 38.99°, 41.76°, 42.54°, 48.48°, 52.36°, 56.5°, 60.16°, 52.36°, 64.98°, 70.34°, 74.02° represented the corresponding reflection planes those were (002), (004), (101), (102), (103), (008), (104), (105), (107), (108), (109), (110), (1011), (1011), (1012), and (118), respectively . The complete removal of 104 peak indicated that destruction of Ti 3 AlC 2 and introduction of surface functional groups (Figure (b)).…”

“…The XRD pattern explained the crystalline nature of the composition. 26,[29][30][31][32][33][34] The complete removal of 104 peak indicated that destruction of Ti 3 AlC 2 and introduction of surface functional groups (Figure 2(b)). The characteristic peaks at 13.0 and 35.9 could not be observed that confirmed the absence of Ti 3 AlC 2 .…”

Torsional Fretting Wear Properties of Thermal Oxidation-Treated Ti3SiC2 Coatings

“…The ternary carbide Ti 3 SiC 2 , one of the MAX phases, is of significant interest for its potential in tribological applications due to its remarkable combination of properties in damage tolerance, machinability, electric and thermal conductivity, self-healing capability, and lubrication [1][2][3][4][5][6][7]. However, the conditions allowing excellent tribological properties are limited to either high sliding speed or high temperature, which cause the formation of tribo-induced oxides on the contact interfaces [8][9][10][11][12][13][14][15].…”