Abstract
The work concerns the characterization of polycrystalline materials composed in Ti–Al–C system such as Ti2AlC and Ti3AlC2. The starting powders were synthesized from metal powder in nitrogen overpressure with the use of SHS method. Such obtained powders were chemically described and hot-pressed at temperatures 1100 °C and 1300 °C. The densification measurements were taken on obtained sintered bodies. The chemical composition analysis and microstructural observation of hot-pressed materials were made. The obtained MAX phase Young’s modulus was examined in the temperature range 25–600 °C by resonance method. The thermal properties of the thermogravimetric analysis were made in air flow to determine the oxygen resistance. The MAX phase polycrystals were taken under laser flash analysis, which allowed to measure directly thermal diffusivity and specific heat and to calculate indirectly thermal conductivity up to the temperature of 700 °C. Additionally, the polycrystalline material was laser treated in continuous work mode. The hot-pressed MAX nanolaminates were laser ablation and laser welding processed, which is new in the literature. The laser beam-treated material places were microstructurally investigated by scanning electron microscopy and chemically by energy-dispersive X-ray spectroscopy. The result of laser processing was discussed regarding material preparation route and its thermal properties.
Highlights
MAX phases are thermodynamically stable nanolaminates, which have a Mn?1AXn stoichiometry, where M stays for an early transition metal, A is an element of A groups, and X is carbon and/or nitrogen
The work concerns the characterization of polycrystalline materials composed in Ti–Al–C system such as Ti2AlC and Ti3AlC2
This kind of structures is hexagonal, layered and has two types of bonds: metallic and covalent [1]. Such a structure is responsible for specific combination of material properties such as high stiffness, moderately low coefficient of thermal expansion and excellent thermal and chemical resistance with low hardness, good compressive strength, high fracture toughness, ductile behavior, good electrical and thermal conductivity which are characteristic for metals & Paweł Rutkowski pawel.rutkowski@agh.edu.pl
Summary
MAX phases are thermodynamically stable nanolaminates, which have a Mn?1AXn stoichiometry, where M stays for an early transition metal, A is an element of A groups (mostly IIIA or IVA), and X is carbon and/or nitrogen. Keywords Ti3AlC2 Á Ti2AlC Á MAX phases Á Thermal properties Á Laser cutting Á Laser welding Because of good thermal shock resistance of quasi-plastic materials [21] and their selfhealing properties [22], the hot-pressed sample was laser beam processed in severe conditions of continuous work mode.
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