FIXATION OF HYDROGEN BY RARE EARTH IN Al-Si ALLOY

Acta Metall Sin

1993, Vol. 29

Issue (1): 16-20 DOI:

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FIXATION OF HYDROGEN BY RARE EARTH IN Al-Si ALLOY

ZHAO Yuguang;LI Daoyun;WANG Shoushi;HE Zhenming Jilin University of Technology; Changchun

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ZHAO Yuguang;LI Daoyun;WANG Shoushi;HE Zhenming Jilin University of Technology; Changchun. FIXATION OF HYDROGEN BY RARE EARTH IN Al-Si ALLOY. Acta Metall Sin, 1993, 29(1): 16-20.

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Abstract Occurrence of RE hydride was identified in the Al-Si alloy containing RE andenrichment of hydrogen in polynary RE intermetallic compound was determined by means ofEPMA, secondary ion mass spectrography, Hg-free vacuum drivepipe hydrogen-meter to-gether with metallography and porosity measurement. The relative contents of various formsof hydrogen before and after RE added in Al-Si alloy have been qualitatively analysed. Aconcept about firm fixation of hydrogen by RE was suggested. It is believed that the hydrogenfixation is the major cause of reducing free hydrogen content and decreasing hydrogen-in-duced defects.

Key words: Al-Si alloy rare earth hydrogen

Received: 18 January 1993

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