Acta Metall Sin  1996, Vol. 32 Issue (7): 711-717    DOI:

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PRECIPITATION AND GROWTH OF DISPERSED PRECIPITATES IN RAPIDLY SOLIDIFIED TITANIUM ALLOYS CONTAINING RARE EARTH NEODYMIUM

YAN Ying; HAN Dong; CAO Mingzhou (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-09-15; in revised form 1996-03-18)

YAN Ying; HAN Dong; CAO Mingzhou (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-09-15; in revised form 1996-03-18). PRECIPITATION AND GROWTH OF DISPERSED PRECIPITATES IN RAPIDLY SOLIDIFIED TITANIUM ALLOYS CONTAINING RARE EARTH NEODYMIUM. Acta Metall Sin, 1996, 32(7): 711-717.

Abstract References Related Articles Recommended Metrics Download:  PDF(507KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The influence of heat treatment on growth of precipitates in Ti-5Al-1.5Nd and Ti-SAl-4Sn-1.5Nd(mass fraction, %) alloy was studied in detail. The experimental results show that many near spherical precipitates are present in the matrix of rapidly solidified titanium alloys containing neodymium. But along the grain boundaries, sub-grain boundaries and dislocation lines, and so on, some particles are deposited in the form of strings of pearls. When Ti alloys containing neodymium are subjected to heat treatments at 650, 700, 750, and 800℃ for 1, 8, 27 and 56 h, respectively, the precipitated particles coarsen slowly. EDAX results show that these particles in the Ti-5Al-1.5Nd alloy are found to be rich in Nd. On the basis of the electron diffraction pattern, these particles are identified as Nd_2O_3 with a cubic structure and lattice parameter a=1. 108 nm. The activation energy for the growth of particles is estimated to be 117 kJ/mol. The addition of tin improved the dispersed degree and reduced the rate of growth of these particles which are found to contain both Nd and Sn by the EDAX analysis. And the average atom ratio of neodymium and tin is about 1.37 : 1 in these particles. Electron diffraction analysis shows that the fine precipitates are orthorhombic Nd_5Sn_4 with lattice parameters a= 0.814 nm, b = 1.732 nm,and c= 0.8 14 nm. The growth activation energy of the particles is estimated to be 170 kJ / mol.Correspondent: YAN Ying, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015 Key words:  titanium alloy      rapid solidification      Nd-rich precipitate      growth activation energy      Received:  18 July 1996      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1996/V32/I7/711 1GschneidnerKAJ,EyringLR．HandbookonthePhysicsandChemistryofRareEarths,Amsterdam,NewYork,Oxford:North-HollandPublishingCompany,1979;2:162李阁平．中国科学院金属研究所博士学位论文,19953 LifshitzIM,SlyozovVV,JPhysChemSolids,1961;19:354WagnerC．ZElektrochem,1961,65:5815BhattacharyyaSK,RussellKC．MetallTrans,1972;3:21956Diffusiondata．Clausthol-Z,Germany:TransThohPublications,1972;6:597RoeWP,PalmerHR,OpieWR．TransAmSocMet,1960;52:1918KonitzerDG,KirchheinR,FraserHL．MaterResSocSympProc,1984;28:3819AskillJ,GibbsGB．PhysStatusSolidi,1965;11:557 [1] ZHAO Pingping, SONG Yingwei, DONG Kaihui, HAN En-Hou. 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