|Saffil alumina fibers reinforced dual-phase Mg-Li and Mg-Li-Zn alloys|
KUDELA Jr., S., ŠVEC, P., BAJANA, O., OROVČÍK, Ľ., RANACHOWSKI, P., RANACHOWSKI, Z.
vol. 55 (2017), no. 3, pp. 195 - 203
The gas pressure infiltration technique was used to prepare Saffil alumina fibers reinforced Mg-Li and Mg-Li-Zn matrix composites with a dual-phase matrix structure. There was investigated the effect of variable Li content (6.2–10.3 wt.% Li) and Zn alloying (~ 1.5 wt.% Zn) on the proof stress Rp0.2 of prepared composites. Rp0.2 values increased monotonously with rising fraction of Saffil fibers (5, 10 and 15 vol.%) reaching the maximum of about 250 MPa for Mg-Li matrix composites. Rp0.2 values of Mg-Li-Zn matrix composites were lower. Strengthening effect of Saffil fibers was promoted by the displacement redox reaction with Mg-Li and Mg-Li-Zn melts in which participated significantly only Li. Zn alloying retarded the displacement redox reaction. Too extensive reaction, however, resulted in the fiber damage and drop in composite strength.
Mg-Li alloys, Saffil fibers, metal matrix composites, short-fiber strengthening, reactive wetting, displacement reactions
Full text (1171 KB)