Acta Metall Sin  1998, Vol. 34 Issue (4): 367-372    DOI:

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STUDY ON THE PLATELET PHASE IN AN YTTRIUM-CONTAINING LOW EXPANSION SUPERALLOY

WANG Rongming; LI Chunzhi; PING Dehai; YAN Minggao (Beijing Institute of Aeronautical Materials; Beijing 100095)(Laboratory of Atomic Imaging of Solids; Institute of Metal Research; The Chinese Academy of Sciences;Shenyang 110015)(Beijing Laboratory of Electron Microscopy; The Chinese Academy of Sciences; Beijing 100080)

WANG Rongming; LI Chunzhi; PING Dehai; YAN Minggao (Beijing Institute of Aeronautical Materials; Beijing 100095)(Laboratory of Atomic Imaging of Solids; Institute of Metal Research; The Chinese Academy of Sciences;Shenyang 110015)(Beijing Laboratory of Electron Microscopy; The Chinese Academy of Sciences; Beijing 100080). STUDY ON THE PLATELET PHASE IN AN YTTRIUM-CONTAINING LOW EXPANSION SUPERALLOY. Acta Metall Sin, 1998, 34(4): 367-372.

Abstract References Related Articles Recommended Metrics Download:  PDF(2369KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The resistance to stress accelerated grain boundary oxygen embrittlement (SAGBO) and the notch-bar rupture life in Fe-Ni-Co low expansion superalloy have been improved with increasing platelet precipitates in the matrix and grain boundaries by trace yttrium element addition. The crystal structure of the platelet phase and its orientation relationship with the matrix have been determined using transmission electron microscopy, convergent beam electron microscopy, X-ray energy dispersive spectrum, X-ray diffraction analysis and high resolution transmission electron microscopy. It has a CaCu5 type crystal structure (space groupP6/mmm) with lattice parameters a=0.498 nm and c=0.408 nm. The crystallographic orientation relationship between the phase and the matrix is found to be (111)γ Key words:  Fe-Ni-Co base superalloy      rare earth element      crystal structure      Received:  18 April 1998      Service E-mail this article Add to citation manager E-mail Alert RSS Collect articles（0） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I4/367 1 Smith D F, Clastworthy E F, Tipton D G, Mankins W L. Superalloys. Metals Park, OH: ASM, 1980: 52 2 Morra M M, Ballinger R G, Hwang J S. Metall bens, 1992; 23A: 3177 3 Sato K, Ohno T. J Mater Eng Perform, 1993; 2. 511 4 Smith D F, Smith J S, Floreen S. In: Gell M, Kortovich C S, Bricknell R H, Kent W B, Radavich J F eds.Superalloys, Metals Park, OH: ASM, 1984: 591 5 Heck K A, Smith D F, Smith J S, Wells D A, Holderby M A. In: Reichman S, Duhl D N, Maurer G,Antolovich S, Lund C eds., Superolloys, TES-AIME, 1988: 151 6 Chen Z. 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