Fracture toughness of metal reinforced glass composites

Fracture Characteristics of Borosilicate Glasses Reinforced by Metallic Particles

“…6. Direct comparison of the present results with previous studies on metal particulate reinforced glass matrices [9][10][11][12][13][14]201 is difficult due to the very different materials and processing conditions investigated. As discussed in the introduction, diferences in thermal expansion and elastic mismatches between matrix and inclusion and the different conditions at the interfaces result in very different fracture behaviour with different crack-particle interaction mechanisms being involved.…”

“…As discussed in the introduction, diferences in thermal expansion and elastic mismatches between matrix and inclusion and the different conditions at the interfaces result in very different fracture behaviour with different crack-particle interaction mechanisms being involved. In general, however, after examining the results in the literature [9][10][11][12][13][14]16,20], it can be concluded that it is generally the case that fracture toughness increases with particle volume fraction. The level of enhancement of toughness has mainly been very modest and similar to that found in the present investigation (e.g.…”

“…For completeness, (two-parameter) Weibull parameters have been determined and are given as scale parameters, K O , and Weibull modulus, m, in Table 4. It will be noted that values of m are high: [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. For such high values, it becomes virtually impossible to distinguish between a Weibull distribution and a Gaussian distribution for rather small numbers of data points and it must be emphasized that the Weibull is a purely empirical fit, whereas the Gaussian results from a physically-based hypothesis, combined with the well-established central limit theorem [41,43].…”

“…Moreover, the individual requirements for the effective exploitation of the individual toughening micromechanism appear to be in conflict. A number of uncertainties remain, for example, in assessing the role of particle ductility and yielding behaviour during crack/particle interaction, due to the constraint imposed by the rigid matrix on the ductile particles, preventing the particle from deforming plastically [ 14,20,22]. For further development of reinforced glass and/or for evaluating its possible structural applications, particularly at elevated temperatures, it is of interest to explore the fracture resistance of glass reinforced by high melting-point ductile metallic particles in relation to its microstructure and processing parameters.…”

Mechanical properties of Zr57Nb5Al10Cu15.4Ni12.6 metallic glass matrix particulate composites

“…In an effort to increase the toughness of this metallic glass while retaining desirable mechanical properties, Zr 57 Nb 5 Al 10 Cu 15.4 Ni 12.6 was combined with particulate reinforcements to make metallic glass matrix/particulate composites. Ductile metals have been shown to improve the toughness in traditional oxide glasses, [5][6][7][8] and Zr-Al-Ni-Cu metallic glass reinforced with ZrC showed increases in Young's modulus, compressive strength, compressive plastic elongation, and hardness. 9 The particles interact with the propagating shear band, causing it to slow (or stop) and deflect, thus delaying failure and improving toughness.…”