A yttrium-containing high-temperature titanium alloy additively manufactured by selective electron beam melting

作者：Lu Sheng-lu; Tang Hui-ping^*; Qian, M.; Hong Quan; Zeng Li-ying; StJohn, D. H.

来源：Journal of Central South University (English Edition), 2015, 22(8): 2857-2863.

DOI：10.1007/s11771-015-2818-x

• titanium alloys
• additive manufacturing
• rare earth elements
• yttrium
• selective electron beam melting

A yttrium-containing high-temperature titanium alloy (Ti-6Al-2.7Sn-4Zr-0.4Mo-0.45Si-0.1Y, mass fraction, %) has been additively manufactured using selective electron beam melting (SEBM). The resulting microstructure and textures were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electron backscattered diffraction (EBSD) and compared with the conventionally manufactured form. A notable distinct difference of microstructures is that additive manufacturing by SEBM enables homogeneous precipitation of fine Y2O3 dispersoids in the size range of 50-250 nm throughout the as-fabricated alloy, despite the presence of just trace levels of oxygen (7x10(-4), mass fraction) and yttrium (10(-3), mass fraction) in the alloy. In contrast, the conventionally manufactured alloy shows inhomogeneously distributed coarse Y2O3 precipitates, including cracked or debonded Y2O3 particles.

• 单位
  东北大学; 西北有色金属研究院