Acta Metall Sin  1992, Vol. 28 Issue (10): 21-24    DOI:

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INVESTIGATION OF BEHAVIOUR OF B IN Ni_3AI ALLOYS BY POSITRON ANNIHILATION TECHNIQUE

DENG Wen; XIONG Liangyue; LONG Qiwei (International centre for Materials Physics; Institute of Metal Research; Academia Sinica; Shenyang); WANG Shuhe; GUO Jianting (Institute of Metal Research; Academia Sinica; Shenyang)

DENG Wen; XIONG Liangyue; LONG Qiwei (International centre for Materials Physics; Institute of Metal Research; Academia Sinica; Shenyang); WANG Shuhe; GUO Jianting (Institute of Metal Research; Academia Sinica; Shenyang). INVESTIGATION OF BEHAVIOUR OF B IN Ni_3AI ALLOYS BY POSITRON ANNIHILATION TECHNIQUE. Acta Metall Sin, 1992, 28(10): 21-24.

Abstract References Related Articles Recommended Metrics Download:  PDF(304KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The behaviour of B atoms added to mono- and poly-crystalline Ni_3Al alloys has been investigated by positron annihilation technique. If an additive of B less than 1.37 at.-%, some of B atoms solid-dissolved interstitially into matrix and distorted the lattice, thus the lifetime of positron in matrix dilated; the others of them segregated on vacancy-like defects and formed" filling effect", thus the mean lifetime and S parameters decreased. If B added up to 2.22 at.-%, more defects having larger free volume were induced by boride eutectic occurred along grain boundaries and grain interior, thus the positron lifetime in vacancy-like defects, mean lifetime and S parameters increased remarkably. Key words:  Ni_3Al      positron annihilation      B additive      defect      Received:  18 October 1992      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/Y1992/V28/I10/21 1 Grala E M. In: Westbrook J H ed., Mechanical Properties of Intermatallic Compounds, New York: Wiley, 1960: 358 2 Moskovic R. J Mater Sci, 1978; 13: 1901 3 Aoki K, Izumi O. Trans Jpn Inst Met, 1978; 19: 203 4 Seybolt A U, Westbrook J H. Acta Metall, 1964; 12: 449 5 青木清,和泉修.日本金属学会志,1977;41:170 6 Liu C T, White C L, Horton J A. Acta Metall, 1985; 33: 213 7 青木清,和泉修.日本金属学会志,1979;43:1190 8 Guo Jianting, Li Hui, Sun Chao, Tan Minghui, Zhu Yaoxiao. Chin J Mech Eng, 1991; 4: 113 9 孙超,李辉,郭建亭.机械工程学报,1990;26(4) :2 10 李辉,刘祥,郭建亭,胡壮麒.金属学报,1989;25:A25 11 郭建亭,李辉,孙超,朱耀宵.金属学报,1989;25:A406 12 熊良钺.正电子湮没技术.中国科学院金属研究所,1986 13 Kirkegaard P, Eldrup M. 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