自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 8    August 2015

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A yttrium-containing high-temperature titanium alloy additively manufactured by selective electron beam melting
LU Sheng-lu(逯圣路)1, 2, 3, TANG Hui-ping(汤慧萍)2, M. Qian(马前)2, 4, HONG Quan(洪权)2, ZENG Li-ying(曾立英)2, D. H. StJohn3

1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2. State Key Laboratory of Porous Metal Materials (Northwest Institute for Nonferrous Metal Research),
Xi’an 710016, China;
3. Centre for Advanced Materials Processing and Manufacturing,
School of Mechanical and Mining Engineering, The University of Queensland, Qld 4072, Australia;
4. Centre for Additive Manufacturing, School of Aerospace, Mechanical and Manufacturing Engineering,
RMIT University, Melbourne, VIC 3001, Australia

Abstract: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 (7×10-4, 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.

 

Key words: titanium alloys; additive manufacturing; rare earth elements; yttrium; selective electron beam melting

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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