Improvement in Ductility at Intermediate Temperatures by a Small Addition of Yttrium in a Cu--30Zn Alloy

The addition of a small amount of yttrium was found to improve ductility at intermediate temperatures or alleviate considerably what is called intermediate temperature embrittlement. The embrittlement in this case was considered to be related to the decrease in grain boundary strength. A trace impur...

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Bibliographic Details
Published in:Scripta metallurgica 1987-11, Vol.21 (11), p.1487-1492
Main Authors: Kanno, M, Shimodaira, N
Format: Article
Language:English
Online Access:Get full text
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Summary:The addition of a small amount of yttrium was found to improve ductility at intermediate temperatures or alleviate considerably what is called intermediate temperature embrittlement. The embrittlement in this case was considered to be related to the decrease in grain boundary strength. A trace impurity of sulfur was detected at a grain boundary fracture surface in a Cu--30Zn alloy, while yttrium sulfides were detected in Y-bearing alloys. Thus, the improvement in ductility was ascribable to the increase in grain boundary strength through the reduction of segregation of S impurity. 11 ref.--AA
ISSN:0036-9748