Metall. Res. Technol.
Volume 112, Number 6, 2015
|Number of page(s)||9|
|Published online||26 October 2015|
Effects of additives on properties of Zr50Al15Ni10Cu25 amorphous powders in low-pressure sintering
1 Department of Applied Physics, Hunan
Agricultural University, Changsha
2 School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China
Accepted: 2 September 2015
Amorphous Zr50Al15Ni10Cu25 powders were prepared by mechanical alloying technique from low-purity raw materials. The beneficial effects of a certain amount of external additives such as C, Si3N4 and SiC powders added to the amorphous powders on the thermal stability, densification and mechanical properties of the Zr50Al15Ni10Cu25 amorphous powders after low-pressure sintering were investigated. The blended powers were hand-pressed into bars in the air under 35 MPa pressure. The preformed bars were sintered in an argon atmosphere under low pressure. The samples were characterized by XRD, SEM, TEM, DSC and tensile testing. The results suggest that the crystallization process of Zr50Al15Ni10Cu25 during sintering could be inhibited for the increase in activation energy when the proper amount of external particles was added to the matrix. Furthermore, suitable additives could help to densify the matrix and improve its mechanical properties in the low-pressure sintering process.
Key words: Zr50Al15Ni10Cu25amorphous powder / additives / densification / bending strength / low-pressure sintering
© EDP Sciences, 2015
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