Effect of grain size, notch width, and testing temperature on the fracture toughness of Ti3Si(Al)C2 and Ti3AlC2 using the chevron-notched beam (CNB) method

Fracture toughness determination of Ti3Si(Al)C2 and Al2O3 using a single gradient notched beam (SGNB) method

“…It can also be seen that with increasing notch width, the fracture toughness increases from 6.20 ± 0.12 MPa m 1/2 to 7.57 ± 0.26 MPa m 1/2 for Ti 3 Si(Al)C 2 , and from 3.99 ± 0.26 MPa m 1/2 to 4.42 ± 0.26 MPa m 1/2 for Al 2 O 3 . This phenomenon has been found in other testing methods like SENB 8,16,18 and CNB 18,23 , which is ascribed to the effect of root radius. 29 When the notch width is ≤200 m, the measured toughness of Ti 3 Si(Al)C 2 and Al 2 O 3 can be considered as a constant and a valid fracture toughness value.…”

“…22 However, it is often difficult to make the two half-notched surfaces on the same plane, leading to the difficulty in preparing the test specimens. 23 This method is also unsuitable to evaluate the R-curve of a material because the initial crack growth length cannot be measured before experimental tests. Hence, the testing methods for determining the fracture toughness of ceramics mentioned above are either difficult in terms of preparing the testing specimens or in having some limitations.…”

Microstructure, mechanical, thermal, and oxidation properties of a Zr2[Al(Si)]4C5–SiC composite prepared by in situ reaction/hot-pressing

“…Furthermore, the fracture toughness of the composite is comparable to the damage-tolerant layered carbides, MAX phases, such as Ti 3 SiC 2 and Ti 3 AlC 2 . 9 The fracture surface of Zr 2 [Al(Si)] 4 C 5 -30 vol.% SiC composite shown in Fig. 5(a) delineates a rough surface morphology with many jagged fractured and fragmentized grains.…”

“…2 However, the hardness of Zr 2 [Al(Si)] 4 C 5 is about half that of ZrC and the fracture toughness is only 3.88 ± 0.16 MPa m 1/2 , which is much lower than other ternary layered carbides, such as Ti 3 SiC 2 and Ti 3 AlC 2 . 9 In addition, as a high-temperature structural material, the oxidation resistance of Zr 2 [Al(Si)] 4 C 5 at high temperature is still unsatisfactory. The oxidation kinetics of Zr 2 [Al(Si)] 4 C 5 generally follows the linear law at 900-1300 • C because no protective Al 2 O 3 scale forms on the substrate.…”

Static and Dynamic Thermo-Mechanical Behavior of Ti2AlC MAX Phase and Fiber Reinforced Ti2AlC Composites

“…The material characterization of MAX phases has been limited to quasi-static loading regimes. The K I values are reported to be in a large range from 4 to 16 MPa m 1/2 are probably attributed to the different grain size, the shape and dimension of the sample, sample impurities, different testing methods, and experimental conditions [10][11][12][13].In this study experiments were conducted to investigate the effect of different strain rate and temperature on the material characteristics. An experimental investigation of the stress strain characteristics of Ti 2 AlC under quasi-static and dynamic loading was conducted at room and elevated temperatures.…”