Fig. 1 a Powder morphology of Ti-15Mo alloy, b particle size distribution of Ti-15Mo alloy, c design and SLM-fabricated samples, d configuration of tensile and cubic samples in this study

Fig. 2 a XRD samples of Ti-15Mo parts fabricated by SLM with different support heights, b bright-field image, c the electron diffraction pattern, d the dark field image of the sample I

Fig. 3 OM and SEM images of the samples: sample I a, d and g, sample II b, e and h, sample III c, f and i. The red dotted line represents the indicator pool boundary

Fig. 4 SEM micrographs of XY and XZ planes of sample I: the horizontal plane a-c, the vertical plane d-f

Fig. 5 Microstructures of sample I a-c and sample III d-f, showing the spiral molten pool generated by the support

Fig. 6 Image quality (IQ) + IPF graphs for samples I a, II b and III c. Grain size calculated by orientation imaging microscopy (OIM): Sample I d, sample II e, and sample III f. The distribution of misorientation angles sample I g, sample II h and sample III i

Fig. 7 PF and IPF showing the (001), (011) and (111) crystallographic directions of the a, d sample I, b, e sample II and c, f sample III

Fig. 8 a True stress-strain curve and b work hardening rate of Ti-15 Mo samples treated with SLM under different tapered support heights

Fig. 9 SEM micrographs showing fracture surfaces sample I a-c, sample II d-f and sample III g-i

Fig. 10 Schematic diagram of heat dissipation for samples I, II and III

Fig. 11 TEM images of Ti-15Mo alloy made by SLM: a sample I, b sample II, c sample III; Kernel average misorientaion images d-f and the results calculated by the OIM g-i of sample I, II and III, respectively

Fig. 12 Grain boundary diagram of sample I a, sample II b and sample III c (green lines indicate low angle grain boundaries, red lines indicate high angle grain boundaries)

Fig. 13 a {110} < 111 > slip system of BCC materials: Schmidt factors b sample I, c sample II, d sample III