| Title |
Mechanical properties of Boron - Doped Ni3Al Intermetallic compounds by Powder Metallurgical Process |
| Authors |
윤의한(Eui Han Yoon); 황선근(Sun Keun Hwang); 정형식(Hyung Sik Chung); 김용진(Yong Jin Kim) |
| Abstract |
High temperature(600℃) tensile properties and microstructure of Ni₃Al intermetallic compound made by either reactive sintering or hot extrusion using elemental powders were studied. The content of Al was varied within a range of 24 to 25 at.% to adjust the chemical stoichiometry and 0.1 wt.% of B was added to suppress the intergranular brittleness. In reactive sintering, rapid densification was achieved below 720 ℃ due to liquid phase formed during heating. The extrusion improved the density and the ambient and high temperature tensile properties of experimental alloys remarkably. The fracture characteristic was changed from intergranular to transgranular by B addition and the ductility was enhanced by reducing Al content from 25 at.% to 24 at.% in Ni₃Al-B alloy. The density and the elongation of hot extruded Ni₃Al- B alloy were 99% and 41%, respectively at room temperature and the yield strength was improved over those of ingot material or reactively sintered material by a factor of two. |