Ultrafine-grained, high-strength NiAl with Al2O3 and Al4C3 nanosized particles dispersed via mechanical alloying in toluene with spark plasma sintering

作者：Udhayabanu V^*; Ravi K R; Murty B S

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2013, 585: 379-386.

DOI：10.1016/j.msea.2013.07.024

• Electron Microscopy
• X-Ray Diffraction
• Intermetallics
• Nanostructured Materials
• Mechanical Alloying
• Plasticity

A 50:50 atomic ratio of elemental Ni and Al powders were subjected to mechanical alloying (MA) in a toluene medium and were consolidated via spark plasma sintering (SPS). The transmission electron microscopy (TEM) results indicated that the ultra-fine grains (226 +/- 107 nm and 307 +/- 150 nm) and nanometre-sized Al2O3 and Al4C3 particles dispersed in the NiAl samples sintered at 900 and 1000 degrees C. A high hardness of 670 HV and a compressive yield strength of 2251 MPa were obtained in the NiAl sintered at 900 degrees C. A maximum plastic strain of similar to 16.5% with a compressive yield strength of 2041 MPa was realised for the NiAl sample sintered at 1000 degrees C. The contributions of the grain size and particles to the strength were calculated using the appropriate strengthening models, and the calculated theoretical yield strength of the synthesised NiAl was found to closely match the experimental values.

• 出版日期2013-11-15