Effect of heat treatments on the microhardness and tensile strength of Al–0.25 wt.% Zr alloy

Simultaneous Increase of Electrical Conductivity and Hardness of Al–1.5 wt.% Mn Alloy by Addition of 1.5 wt.% Cu and 0.5 wt.% Zr

“…Alloys with the addition of zirconium are the most suitable for solving this problem [16][17][18][19]. This element (usually in an amount of 0.3%-0.4%) is an effective hardener in aluminum alloys due to the formation of Al 3 Zr (L1 2 ) phase secondary precipitates, which are less than 10 nm in diameter [20,21]. These nanoparticles are formed during annealing via decomposition of the supersaturated as-cast (Al).…”

Mechanical properties and optimization of the aging of a dilute Al-Sc-Er-Zr-Si alloy with a high Zr/Sc ratio

“…Due to the small diffusivity of Zr in aluminum [2], precipitation strengthening of Al-Zr alloys is extremely sluggish, generally needing more than 100 h of aging to reach peak microhardness [5][6][7][8][9][10]. The metastable Al 3 Zr(L1 2 ) precipitatesachieve relatively small number densities, so the strengthening effectis smaller than when using Sc, thus limiting usage of Al-Zralloys.Al 3 Zr(L1 2 ) precipitates exhibita higher coarsening resistance than Al 3 Sc(L1 2 ) precipitates.…”

Effect of solidification parameters on microstructural characteristics and mechanical properties of directionally solidified binary TiAl alloy

“…[21][22][23][24]. Many correlations are proposed to evaluate the strength by hardness test for steels [21,25,26], Al-based alloys [27][28][29][30][31][32][33][34], Cu-based alloys [22,35], Zn-based alloys [36,37], Sn-based alloys [38][39][40], and TiAl alloys [15-20, 41, 42]. However, few researches focus on the correlations between hardness and tensile strength of TiAl intermetallics alloys.…”