Fig. 1. Powder, printed samples, and scanning strategy. (a)(b) Morphology of Cu-Al-Mn powder; (c) particle size distribution of the powder ; (d)(e) printed samples by SLM; (f) size diagram of tensile samples; (g) scanning strategy diagram (BD: building direction)

Fig. 2. U-shaped mould and bending method schematic for measuring one-way shape memory effects. (a) U-shaped mould; (b) bending method schematic

Fig. 3. Relative density versus laser power for SLM samples and OM images of SLM samples. (a) Relative density versus laser power; (b)-(f) OM images of SLM samples

Fig. 4. XRD patterns. (a) XRD patterns of the powder and SLM samples at room temperature; (b) local area amplification; (c) high-temperature XRD diffraction patterns of SLM samples at 185 °C

Fig. 5. DSC curve of Cu-Al-Mn powder

Fig. 6. DSC curves and relationship between phase-transition temperature and laser power. (a) DSC curves of SLM samples; (b) relationship between A_s, A_f, M_s, M_f and laser power

Fig. 7. Martensite morphology of SLM samples. (a)(b) P=175 W; (c)(d) P=275 W; (e)(f) P=375 W

Fig. 8. TEM images of SLM sample (P=325 W). (a)(b)(e) Bright field images of martensite; (c) high-resolution image corresponding to Fig.8(b); (d) selected area electron diffraction image corresponding to Fig.8(b)

Fig. 9. Relationship between microhardness of SLM sample and laser power

Fig. 10. Engineering stress-strain curve and tensile fracture morphology of SLM samples. (a) Tensile engineering stress-strain curve of SLM sample; (b)(c) tensile fracture morphology of the XY-sample when P = 375 W

Fig. 11. Tensile local strain nephograms. (a) P=175 W; (b) P=375 W

Fig. 12. Shape memory effect test of SLM samples

Fig. 13. Relationship between residual strain and elongation and room temperature loading-unloading cyclic tensile curves. (a) Relationship between residual strain and elongation; (b)-(f) room temperature loading-unloading cyclic tensile curves corresponding to the samples with different laser powers