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- Nanoindentation indentation creep modeling nickel dislocation glide athermal flow strength activation energy indentation creep finite-element deformation molybdenum behavior tantalum alloy (1)
- Tribology surface chemistry morphology composite scanning electron microscopy sliding wear behavior mechanically mixed-layer metal-matrix-composites particulate composites friction material brake pads aluminum alloy carbide steel (1)
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Tribo-Surface Characteristics Of Al-B4c And Al-Sic Composites Worn Under Different Contact Pressures, Haseeb Asma
Tribo-Surface Characteristics Of Al-B4c And Al-Sic Composites Worn Under Different Contact Pressures, Haseeb Asma
Haseeb ASMA
Tribo-surface characteristics of two aluminium metal matrix composites (Al-MMC) of compositions Al-13 vol%B4C and Al-13 vol%SiC sliding against a commercial phenolic brake pad have been investigated under dry conditions. The wear tests were carried out using a pin-on-disc type apparatus at a linear speed of 1.62 ms(-1) under contact pressures ranging from 0.75 to 3.00 MPa. The coefficient of friction was recorded on line. Wear rates were calculated from mass loss measurements. Scanning electron microscope equipped with energy dispersive X-ray spectroscopy was used to examine the tribo-surface. It is found that wear rate of both composites increases with increasing contact …
Modeling Of The Effects Of Athermal Flow Strength And Activation Energy For Dislocation Glide An The Nanoindentation Creep Of Nickel Thin Film At Room Temperature, Haseeb Asma
Haseeb ASMA
Nanoindentation creep behaviour of nickel at room temperature has been modeled based on the obstacle-controlled dislocation glide mechanism. Using the model, the effects of two important materials parameters viz. the activation free energy required by dislocation to overcome an obstacle without any aid from external stress, Delta F and the athermal flow strength, tau(0), which is the flow strength of solids at 0 K are systematically studied. It has been found that Delta F plays a dominant role in room temperature creep properties of nickel. The role of Delta F is particularly dominant in determining the time dependent deformation. On …