Engineering Conferences International
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Pilot-scale continuous flow hydrothermal liquefaction of mixed textile waste and subsequent bio-oil upgrading
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Fate of lead and other heavy metals during pyrolysis of lignocellulosic biomass
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Anaerobic digestion of aqueous pyrolysis condensate enhanced by biochar: a circular economy approach
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In-situ micromechanical testing of Su-8 polymer at high strain rates using indentation and micropillar compression
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Nanoindentation induced reversible plasticity detected by acoustic emission
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High strain rates micromechanical behavior of materials: A coupled experimental and numerical approach
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Nanoindentation creep testing using the constant contact pressure method
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The effect of size, crystal orientation and temperature on the deformation of cast microwires
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Fracture propagation in glassy polymers: From nanometer to centimeter
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Solid solution hardening effects on structural evolution and mechanical properties of nanostructured high entropy alloys
Get PDFThe equiatomic Cantor alloy and Ni-enriched derivates of it ((CrMnFeCo)xNi1-x with x = 0.8, 0.4, 0.08 and 0) were deformed by high pressure torsion to the saturation regime and subsequently annealed up to 900°C. The HEA alloy compositions exhibits the highest solid solution strengthening, leading to the smallest saturation grain size as well as highest thermal stability, but a phase decomposition at intermediate temperatures. The differences in microstructural stability are also reflected by the mechanical properties as studied via Nanoindentation strain rate jump and constant contact pressure experiments. All alloys show pronounced pileup around the indentation, which is even increasing after annealing, leading seemingly to a peak in hardness and modulus of the HEA alloys. After correction, the hardness of the HEA type alloys remains constant up to 450 °C (Ni60) or even increases up to 500 °C (Ni20) followed by a softening at higher annealing temperatures. Transients are observed during strain rate change, with a slightly enhanced rate sensitivity of the dilute alloys. Furthermore, stress reduction experiments indicate higher rate sensitivities at low applied contact stresses and small deformation rates. However, the Ni-based alloys remain fairly stable at RT deformation