Nanoindentation characteristics of Zr69.5Al7.5-xGaxCu12Ni11 glasses and their nanocomposites

作者：Singh Devinder; Mandal R K^*; Tiwari R S; Srivastava O N

来源：Journal of Alloys and Compounds, 2011, 509(35): 8657-8663.

DOI：10.1016/j.jallcom.2011.06.076

• Metallic glasses
• Quasicrystals
• Rapid solidification
• Quenching
• Mechanical properties
• Atomic force microscopy (AFM)

This work deals with the indentation behavior of Zr69.5Al7.5-xGaxCu12Ni11 (x=0, 1.5, 7.5 at.%) alloys. A comparison between their nanohardness and reduced elastic modulus values of the as-synthesized glassy phase with their nanocomposites has been made. The indentation characteristics of a novel Ga substituted glass composition corresponding to x=7.5 have shown significant improvement in regard to hardness and elastic modulus. The evidence of pile up has been observed in case of as-synthesized glassy ribbons. The load ( P) versus depth ( h) curves for as-synthesized melt-spun ribbons displayed the presence of displacement burst, which are known as pop-ins. The amount of energy per unit volume required for the shear band formation in glassy state has been estimated based on the pop-ins observed in P-h curve. This seems to decrease with Ga addition. Based on transmission electron microscopic observations of indented glassy specimen, the possibility of nanocrystallization has been ruled out.

• 出版日期2011-9-1