Micromechanics and indentation creep of magnesium carbon nanotube nanocomposites: 298 K–573 K
نویسندگان
چکیده
In the present study, time-dependent plastic deformation (creep) response of magnesium/carbon nanotube (CNT) nanocomposites containing 0.25, 0.5, and 0.75 vol% CNTs is investigated through instrumented indentation tests against monolithic pure magnesium. The Mg-CNT were synthesized via powder metallurgy coupled with microwave sintering followed by hot extrusion. Indentation creep performed at 298, 373, 473, 573 K a cubic boron nitride Berkovich indenter. Creep are dual-stage, i.e., all involve loading to prescribed peak load (50 mN), holding this constant for set dwell period (120 s), finally unloading. Three rates 5, 50 mN/s tested. Results explained hardness, microstructure, CNT volume fraction in each sample. Mg reinforced 0.25–0.5 exhibit best resistance. At ambient temperature 298 K, dislocation dominant mechanism. elevated temperatures, multiple mechanisms identified. However, diffusion expected prevail when temperatures exceed K. These materials promising candidates aerospace, automotive, military, many other industrial applications. To end, findings study can be used material selection these industries. This work may also as baseline future high-temperature nanoindentation studies on nanocomposites.
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ژورنال
عنوان ژورنال: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
سال: 2021
ISSN: ['0921-5093', '1873-4936']
DOI: https://doi.org/10.1016/j.msea.2020.140418