|
|
Characterization of thermal-induced distorted face-centered cubic structure in pure titanium |
Hai-chen Wu1 Xiao-fang Bi1 |
1 School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
|
|
Abstract After 900 C high-vacuum annealing and air cooling, a special band was observed in pure titanium. Energy-dispersive spectrum showed that the composition of the band and the matrix is the same. By tilting the band to different zone axes and taking selected-area electron diffraction (SAED) patterns, we found that the structure of the band is distorted face-centered cubic (fcc) with the lattice constants a, b, and c deviating slightly from each other on the basis of the analyses of the SAED patterns together with the tilting angles. The lattice constants a, b, and c are calculated based on the measurement of interplanar spacing according to high-resolution transmission electron microscopy (HRTEM) images. The orientation relation between the hexagonal-close-packed (hcp) matrix and the distorted fcc band is [1120]hcp//[110]fcc and (0001)hcp// (111)fcc according to SAED analysis. The phase boundary between the matrix and the band was observed to demonstrate serrated configuration composed of two kinds of micro-steps: (111)//(0002) and (111)//(1011) on the basis of Cs-corrected HRTEM characterization. The distorted fcc band is deduced to be a thermal-induced metastable phase transformed from the high-temperature body-centered cubic (bcc) structure during the allotropic transformation from bcc to hcp based on orientation relation analysis.
|
|
|
|
|
Cite this article: |
Hai-chen Wu,Xiao-fang Bi. Characterization of thermal-induced distorted face-centered cubic structure in pure titanium[J]. Journal of Iron and Steel Research International, 2019, 26(6): 653-658.
|
|
|
|
[1] |
Guo-chao Li, Xu Cheng, Hua-ming Wang. Improvement of proof-ultimate strength difference in laser additive manufactured Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si alloy by tuning basketweave structure[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(6): 631-636. |
[2] |
Dong Hou, Zhou-hua Jiang, Tian-peng Qu, De-yong Wang, Fu-bin Liu, Hua-bing Li. Aluminum, titanium and oxygen control during electroslag remelting of stainless steel based on thermodynamic analysis[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(1): 20-31. |
[3] |
Jin-biao Zhou, Peng-yan Sun, Chang-yu Zhou, Xiao-hua He. Experimental characterization of anisotropic tensile mechanical behavior of pure titanium tube[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(1): 91-101. |
[4] |
Xi-yang Chai, . Tao Pan . Feng Chai . Xiao-bing Luo . Hang Su . Zhi-gang Yang . Cai-fu Yang. Interlayer engineering for titanium clad steel by hot roll bonding[J]. , 2018, 25(7): 739-745. |
[5] |
Zhang-wei-jia Qiu, . Hua-meng Fu, . Hong-wei Zhang, . Hong Li . Zheng-kun Li . Long Zhang . Zheng-wang Zhu . Ai-min Wang . Hai-feng Zhang. Effects of Ti addition on corrosion behavior of Zr-based metallic glass in chloride medium[J]. , 2018, 25(6): 650-657. |
[6] |
Guo-chao Li ? Xu Cheng ? Xiang-jun Tian. Effects of annealing temperature and cooling rate on microstructures of a novel titanium alloy Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si manufactured by laser additive manufacturing[J]. , 2018, 25(4): 442-452. |
|
|
|
|