OBSERVATION OF IMPURITY HYDROGEN EVOLVED FROM ALUMINUM DURING DEFORMATION BY MEANS OF SILVER DECORATION TECHNIQUE

Citation
K. Koyama et al., OBSERVATION OF IMPURITY HYDROGEN EVOLVED FROM ALUMINUM DURING DEFORMATION BY MEANS OF SILVER DECORATION TECHNIQUE, Nippon Kinzoku Gakkaishi, 62(8), 1998, pp. 742-747
Citations number
9
Categorie Soggetti
Metallurgy & Metallurigical Engineering
Journal title
ISSN journal
00214876
Volume
62
Issue
8
Year of publication
1998
Pages
742 - 747
Database
ISI
SICI code
0021-4876(1998)62:8<742:OOIHEF>2.0.ZU;2-C
Abstract
Silver decoration technique was applied to high purity aluminum specim ens with two impurity hydrogen levels to visualize the hydrogen atoms evolved from the specimen during tensile deformation. The specimens we re deformed by about 5% in the silver decoration solution of K[Ag(CN)( 2)]. A number of needle-shaped deposits indicating hydrogen evolution were revealed along coarse slip lines produced by the deformation. The deposits were identified by AES not as metallic silver but as AgCN cr ystals. The amount of the deposits was affected significantly by the i mpurity hydrogen content of the specimen and by pH and temperature of the silver decoration solution, but not markedly by K[Ag(CN)(2)] conce ntration in the solution. This new method using silver decoration tech nique is a relatively simple and valuable tool for the study of hydrog en embrittlement of metals and alloys.