Observation of etch pits in Fe-36wt%Ni Invar alloy

To indirectly investigate the dislocation behavior of Fe-36wt%Ni Invar alloy by the etch pit method, polished Invar specimens were etched by a solution containing 4 g copper sulfate, 20 mL hydrochloric acid, and 20 mL deionized water for 2 min. Etch pits in the etched surfaces were observed. All the...

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Bibliographic Details
Published inInternational journal of minerals, metallurgy and materials Vol. 21; no. 7; pp. 682 - 686
Main Authors Lu, Dong-zhu, Wu, Min-jie
Format Journal Article
LanguageEnglish
Published Beijing University of Science and Technology Beijing 01.07.2014
Springer Nature B.V
Division of Surface Engineering of Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Subjects
Alloying additive
Alloying elements
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
COPPER SULFATE
Corrosion and Coatings
Deionization
Dislocations
Etch pits
ETCHING
Etching (metallography)
Ferrous alloys
Glass
Grain boundaries
Grains
Hydrochloric acid
Iron
IRON ALLOYS (50 TO 99 FE)
Low expansion alloys
Materials Science
Metallic Materials
Natural Materials
Nickel
Surfaces and Interfaces
Thin Films
Tribology
位错
去离子水
合金元素
因瓦合金
晶粒间界
腐蚀坑
重量
Invar alloy
etch pit technique
dislocations
alloying elements
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Summary:To indirectly investigate the dislocation behavior of Fe-36wt%Ni Invar alloy by the etch pit method, polished Invar specimens were etched by a solution containing 4 g copper sulfate, 20 mL hydrochloric acid, and 20 mL deionized water for 2 min. Etch pits in the etched surfaces were observed. All the etch pits in one specific grain exhibited similar shapes, which are closely related to the grain orienta-tions. These etch pits were characterized as dislocation etch pits. It was observed that etch pits arranged along grain boundaries, gathered at grain tips and strip-like etch pit clusters passed through a number of grains in the pure Invar specimens. After the addition of a small amount of alloying elements, the identification of a single dislocation etch pit is challenging compared with the pure Invar alloy. Thus, the observation of etch pits facilitates the investigation on the dislocation behavior of the pure Invar alloy. In addition, alloying elements may affect the densities and sizes of etch pits.
Bibliography:To indirectly investigate the dislocation behavior of Fe-36wt%Ni Invar alloy by the etch pit method, polished Invar specimens were etched by a solution containing 4 g copper sulfate, 20 mL hydrochloric acid, and 20 mL deionized water for 2 min. Etch pits in the etched surfaces were observed. All the etch pits in one specific grain exhibited similar shapes, which are closely related to the grain orienta-tions. These etch pits were characterized as dislocation etch pits. It was observed that etch pits arranged along grain boundaries, gathered at grain tips and strip-like etch pit clusters passed through a number of grains in the pure Invar specimens. After the addition of a small amount of alloying elements, the identification of a single dislocation etch pit is challenging compared with the pure Invar alloy. Thus, the observation of etch pits facilitates the investigation on the dislocation behavior of the pure Invar alloy. In addition, alloying elements may affect the densities and sizes of etch pits.
Invar alloy; dislocations; etch pit technique; alloying elements
11-5787/T
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-014-0958-x