Acta Metall Sin  1997, Vol. 33 Issue (8): 851-862    DOI:

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INFLUENCES OF Y~+-IMPLANATION ON INTERFACIAL DEFECTS AND SPALLING MECHANISM OF Cr_2O_3 SCALE FORMED ON Ni30Cr DIRECT1ONAL SOLIDIFICATION ALLOY

XIN Li; LI Tiefan; LI Meishuan; JIN Huiming; SHI Changxu (State Key Laboratory for Corrosion and Protection; Institute ofCorrosion and Protection of Metals; Chinese Academy ofSciences; Shenyang 110015) (Manuscript received 1996- l0-24; in revised form 1997-01 -09)

XIN Li; LI Tiefan; LI Meishuan; JIN Huiming; SHI Changxu (State Key Laboratory for Corrosion and Protection; Institute ofCorrosion and Protection of Metals; Chinese Academy ofSciences; Shenyang 110015) (Manuscript received 1996- l0-24; in revised form 1997-01 -09). INFLUENCES OF Y~+-IMPLANATION ON INTERFACIAL DEFECTS AND SPALLING MECHANISM OF Cr_2O_3 SCALE FORMED ON Ni30Cr DIRECT1ONAL SOLIDIFICATION ALLOY. Acta Metall Sin, 1997, 33(8): 851-862.

Abstract References Related Articles Recommended Metrics Download:  PDF(3743KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Acoustic emission was used to monitor the scale cracking and spalling of unimplanted and 1 × 1017 Y+ / cm2-implanted Ni3OCr directional solidification alloy samples that had been oxidized at 1000℃ for 20 h then furnace cooled to room temperature. The morphology of the remaining scale and spalled areas was observed by SEM. The AE results show that the cracking and spalling of the scales formed on transversal and longitudinal sam-ples are similar though their microstrutures are different. The cracking and spalling occoured on the scales of unhoplanted alloy. The crack initiated at the interfacial voids and grain boundaries, then propagated into the scale and produced spalling. The scale formed on Y+-implanted sample was significantly more resistant to fracture than that on unimplanted sample. AE results prove that Y+- implanation apparently decreases the amounts of the interfacial naws and reduces the mean size of the flaws. Key words:  NiCr alloy      acoustic emission      Y~+-implanation      oxide scale      interface      Received:  18 August 1997      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/Y1997/V33/I8/851 1 Douglass D L. Corros Sci,1968; 8: 665 2 Evans H E, Lobb R C. Corros Sci, 1984, 24: 209 3李美栓,李铁藩,周龙江.中国腐蚀与防护学报,1990;11:217 4 Zhang Yifan, Shores D A. Oxid Met,1993; 40: 529 5靳惠明,李铁藩,李美栓,沈嘉年,辛丽,宫泽祥.中国腐蚀与防护学报,已接收 6 Tien J K, Davidson J M. In: Cathcart J V ed., Stress Effect and the Oxdation of Metal. TheMetallurgical Society of AIME,1974: 201 7 Evans H E. Mater Sci Technol, 1988, 4: 415 8 Evans A G, Crumley G B, Demaray R E. Oxid Met, 1983; 20:193 9 Hou P Y, Stringer J. OxidMet, 1992; 38: 323 10 Stott F H. 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