3Ti析出相的非均相形核，晶粒尺寸范圍減小到2.5 μm以內(nèi)。隨著小角度晶界的增大，晶格畸變能增大，平均納米硬度和楊氏模量分別提高到2.36 和92.72 GPa。添加3% Ti后，LPBF處理的Al基合金<100>織構(gòu)略有增強，但仍有一個隨機的晶體取向。獲得了α-Al向Al3Ti的相變。;The influence of Ti addition into Al-based alloy fabricated by laser powder bed fusion (LPBF) technique was demonstrated. The microstructure characteristics, phase identification and nano-hardness of the LPBF-processed samples without or with 3wt% Ti addition were investigated by scanning electron microscope, electron backscatter diffraction, X-ray diffraction, transmission electron microscope and nano-indentation tests. The results reveal that a refined grain microstructure and lower average grain sizes can be obtained. Due to the heterogeneous nucleation provided by Al3Ti precipitated phases, the ranges of grain sizes are reduced within 2.5 μm. As the low angle grain boundary increases, higher crystal lattice distortion energy contributes to the increase in average nano-hardness (to 2.36 GPa) and Young's modulus (to 92.72 GPa) values. The <100> texture of LPBF-processed Al-based alloy with 3wt% Ti addition is slightly enhanced, while there is still a random crystal orientation. The phase transformation from α-Al to Al3Ti can be obtained."/>