Development of texture and grain size during extrusion of ZA63 alloy containing stable quasicrystalline i-phase and its effect on tensile and compression strength

0540755 - FZÚ 2021 RIV NL eng J - Journal Article
Tesař, Karel - Somekawa, H. - Singh, A.
Development of texture and grain size during extrusion of ZA63 alloy containing stable quasicrystalline i-phase and its effect on tensile and compression strength.
Journal of Alloys and Compounds. Roč. 849, Dec (2020), s. 1-11, č. článku 156340. ISSN 0925-8388. E-ISSN 1873-4669
Institutional support: RVO:68378271
Keywords : metals and alloys * microstructure * quasicrystals * scanning electron microscopy (SEM) * mechanical properties
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.316, year: 2020
Method of publishing: Limited access
https://doi.org/10.1016/j.jallcom.2020.156340

We have focused on dispersion of quasicrystalline i-phase in a Rare Earth-free magnesium alloy Mg6Zn3Al (ZA63). The cast alloy was subjected to a two-step direct extrusion process to study phase (particle) distribution, grain structure, microtexture and related parameters using a host of techniques associated with scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the resulting mechanical properties. The first extrusion (at 563 K) with a small extrusion ratio of 6.25:1 produced a dispersion of φ phase along the extrusion direction and i-phase decorating the boundaries of grains of size of about 30 μm with a mild basal texture. The second extrusion (at 483 K) with an extrusion ratio of 25:1 reduced the average grain size to 2μm, with comparable yield strength 287.0±4.1 MPa in tension and 299.0 MPa in compression (elongations ~21%).
Permanent Link: http://hdl.handle.net/11104/0318360