Abstract

Mechanically-alloyed NiAl powder was sintered by Spark-Plasma Sintering (SPS) process. Densification and behavior mechanical property were determined from the experimental results and analysis ,such as changes in linear shrinkage, shrinkage rate, microstructure, and phase during sintering process, Victors hardness, and transver.ie-rupture-strength (TRS). Above 97% relative density was obtained after sintering at 1150°C for 5 min. Crystallite size determined by the Scherrer method was approximately 50 nm. From the X-ray diffraction analysis it was confirmed that the sintered bodies were composed mainly of NiAl phase together with Ni_3Al phase. Measured Vickers hardness and TRS value were 555pm10 H_v and 1393pm75 MPa , respectively.

• Keywords: NiAl;Spark-plasma sintering;Mechanical alloying;Victors hardness;Transverse-rupture strength;4-point bending strength;Fracture toughness;Elastic modulus;