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Variable Thermal Loading Analysis of Single Crystal Tungsten (111)

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The temperature response of properties of Single crystal tungsten (111) at high temperature is still not been thoroughly understood. All the mechanical properties are temperature dependent. The experiments are performed with tailor made Berkovich tip of radius 100 nm with temperatures of 373 K, 473 K and 623 K to study the behavior of Single crystal Tungsten at various temperatures. The new phenomena of material under the indenter bouncing back at the end of unloading were clearly noticed, due to the accumulation of high energy. One particularly interesting observation is the appearance of discrete plasticity during the unloading segment as evidenced by a displacement burst or pop-in at ∼1 mN at elevated temperatures. It is also noted that the elastic recovery reduces at higher temperatures. The results for different temperatures are compared. Our experiments clearly show the periodic bursts and the softening effects. Pile up is observed. It is noticed that there is significant drop in hardness, elastic modulus and increase in displacement with increasing temperature. This softening phenomenon corresponds to the increase of indentation depth for the same loading conditions. Clear bursts are seen showing the nucleation of dislocations. At higher peak loads, the indentation contact in tungsten is not just elastic. Tungsten is chosen to illustrate the temperature dependence behaviour because of its isotropic elastic behaviour at low loads. This work attempts to explore the complete behaviour of metals at various temperatures, including the initial burst, the complete elastic recovery, the softening effect and the modulus and Hardness.

Affiliations: 1: Principal, Paavai College of Engineering, Tamilnadu, India; 2: National Institute of Technology, Trichy, India


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