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"Microstructure, mechanical and tribological properties of Al0.3CrFeNiT" by Cuong Nguyen, Anh Kiet Tieu et al.

In this study, a bulk solid Al0.3CrFeNiTi0.3-CaF2/BaF2 (HEA-CaF2/BaF2) self-lubricating composite was successfully fabricated using spark-plasma sintering (SPS) method. The phase constitutions, microstructural features, and mechanical properties of the composite have been extensively characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), compression and nanoindentation tests. The composite exhibited superior mechanical properties at room temperature (RT), and excellent thermal-mechanical stability from RT to 600 °C. Additionally, the composite possessed superior anti-friction and anti-wear properties in a broad temperature range below 900 °C, particularly showing even much enhanced lubricating capacity than HEA-Ag composite in the medium temperature range of 300–600 °C. The dominant wear mechanism of HEA-CaF2/BaF2 composite was abrasion when temperature was RT-300 °C, while it changed to adhesion and oxidation when ....

Advanced Manufacturing , Friction And Wear , High Entropy Alloys Heas , High Temperature Nanoindentation , Elf Lubricating Composite , Park Plasma Sintering Sps ,

"High temperature tribological performance of a cost-effective eutectic" by Tri Dinh Vo, Anh Kiet Tieu et al.

A comprehensive comparison study on microstructure, mechanical and high temperature tribological performance of as-cast Al0.8CrFeNi2.2 and AlCoCrFeNi2.1 eutectic high entropy alloys was conducted. The cost-effective Al0.8CrFeNi2.2 exhibited higher hardness and tensile strength than AlCoCrFeNi2.1. AlCoCrFeNi2.1 showed better friction and wear performances than Al0.8CrFeNi2.2 at RT, but an opposite trend was observed when temperature exceeded 300 oC. Higher Ni content in FCC and BCC(B2) phases of Al0.8CrFeNi2.2 are found to increase the hardness of constitution phases. The tribolayers of Al0.8CrFeNi2.2 at 900 oC composes of distinguished oxide layer and ultrafine-grained particles layer, which are different from the mixing pattern in AlCoCrFeNi2.1. A relatively thicker tribo-layer is also found to enhance the high temperature tribological properties of Al0.8CrFeNi2.2. ....

Al Crfeni 0 8 2 , Lcocrfeni 2 1 , Cost Effective , Utectic High Entropy Alloy Ehea , High Temperature Nanoindentation , Igh Temperature Tribology ,

The Development of High Temperature Nanoindentation

The Development of High Temperature Nanoindentation
Sponsored by Alemnis AGMay 26 2021
High-temperature nanoindentation is a popular method with numerous applications in materials science, bioscience, coatings and additive manufacturing. The method is generally utilized for the investigation of the mechanical properties of materials at small length scales.
Since mechanical properties are usually temperature-dependent, the development of high-temperature nanoindentation will have a significant impact relative to industrial applications where materials are used or processed at high temperatures.
The Development of Nanoindentation
Indentation tests cover a range of techniques for identifying the mechanical properties of materials.
These tend to follow the same format: indent a test material with a probe until an impression is created, and characterize the mechanical properties of this material dependent on the size of the load, displacement of ....

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