Microstructure and mechanical properties of crystalline particulates dispersed Ni-based metallic glassy composites fabricated by spark plasma sintering

Designing in situ and ex situ bulk metallic glass composites via spark plasma sintering in the super cooled liquid state

“…An optimum addition of W has been shown to improve the yield strength and induce ductility in Zr-based BMGs [123] and Ni-based BMGs [124]. In both reports, the ductility is attributed to the popular notion that the crystalline W phase restricts shear band propagation and promotes the generation of multiple shear bands in the matrix phase.…”

“…Thus, our study of particle size effects to control residual stress and the use of reinforcement phases with different coefficients of thermal expansion compared to the SAM2X5 matrix are highly relevant to optimizing mechanical properties. Xie et al [124] used an applied stress of 600 MPa to incorporate W (2-3 m in size) into a Ni-based BMG by viscous forming, and reported an optimum volume fraction of 5% W to enhance both yield strength and ductility. However, additional W was also found to decrease the density below 99% of theoretical, consistent with our results presented in Figure 9(a).…”

Approach of the spark plasma sintering mechanism in Zr57Cu20Al10Ni8Ti5 metallic glass

“…Consolidation with SPS of atomized MG powders has thus been obtained for Fe-based alloys, with good magnetic properties [14,15], for Cu-and Ni-based alloys with high hardness and strength [16,17]. The technique has also shown further perspective for the development of architectured materials with the fabrication of in situ composites (devitrification in powder fabrication [18] or during SPS [19]), ex situ composites by powder mixing [20,21], or dual amorphous materials [22]. These new architectured materials exhibit interesting behaviours such as improved ductility and damage resistance.…”

Correlation between the enhanced plasticity of glassy matrix composites and the intrinsic mechanical property of reinforcement

“…The other one is the hard phase (ceramics) reinforcement such as SiC [13], Al 2 O 3 [8] and Si 3 N 4 [14]. And they possess higher yield strength.…”