Achieving superior high-temperature mechanical properties in Al-Cu-Li-Sc-Zr alloy with nano-scale microstructure via laser additive manufacturing

Figures & data

Figure 1. Mechanical properties of LPBF-fabricated Al-Cu-Li-Sc-Zr alloy in both AF and HT states: (a, b) tensile curves of the alloy at various testing temperatures in the AF and HT states, respectively, (c, d) temperature-dependent yield strength and elongation compared with other LPBF-fabricated aluminum alloys (Al-Ce-Mn [14], Al-Cu-Mn-Zr [20], Al-Cu-Mn-Zr + TiO₂ [15], Al-Mg-Zr [9], Al-Mg-Si-Sc-Zr [10], Al-Si-Mg [18, 19], Al-Si-Mg + TiCN [16], Al-Ti-Cu-Mg-B-Ni-Fe [29]).

Table 1. Tensile properties of as-fabricated and heat-treated samples at various testing temperatures.

Samples	yield strength (MPa)	Elongation (%)
AF-RT	482 ± 1	9 ± 1
AF-200 ℃	402 ± 14	11 ± 2
AF-250 ℃	355 ± 10	16 ± 2
AF-300 ℃	177 ± 7	26 ± 3
HT-RT	595 ± 14	2 ± 1
HT-200 ℃	366 ± 3	16 ± 5
HT-250 ℃	319 ± 13	30 ± 7
HT-300 ℃	170 ± 7	38 ± 9

Figure 2. EBSD results of (a ∼ d) AF and (e ∼ h) HT samples: (a) and (e) IPF maps; (b) and (f) pole figures; (c) and (g) equiaxed grain size statistical graph; (d) and (h) columnar grain size statistical graph.

Figure 3. TEM analysis showing the HAADF images and corresponding EDS maps of: (a) equiaxed grain area of AF sample, (b) columnar grain area of AF sample, (c) equiaxed grain area of HT sample, and (d) columnar grain area of HT sample; (e) statistical results of precipitate size; EBSD analysis showing the TKD results within the equiaxed grain area of AF sample: (f) phase map and (g) IPF map.

Figure 4. Diffusion coefficients of Cu, Sc, Zr, Mg, Si, and Zn in Al at different temperatures.

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