Cu-2%Be-0.25%Co系実用合金の粒界反応による異常軟化と組織変化について

DOI Web Site Web Site

書誌事項

タイトル別名
  • On the Anomalous Softening and Structure Change of Cu-2%Be Alloys due to Discontinuous Precipitation
  • Cu-2 Be-0.25 Coケイ ジツヨウ ゴウキン ノ リュウカイ ハンノウ ニ ヨル イジョウ ナンカ ト ソシキ ヘンカ ニ ツイテ

この論文をさがす

抄録

In order to clarify an unsatisfactory hardening characteristic observed in some melts of commercial Cu-Be alloys, four kinds of specimens of similar composition were prepared; three of them were arranged as industrial scale experiments under different procedures assigned, the other specimen was imported as a commercial strip from Beryllium Corp’n U.S.A. The hardness changes with aging time were examined together by microscopic observation, and then discontinuous precipitation at the initial stage was observed by electron micrography. The results were as follows: (1) When aged at 310°C the specimen “Z” showed considerable rapid hardening at the initial stage, followed by rapid softening, whereas in the imported Alloy B no such trend was observed up to 6 hrs, and in the other two specimens slight but not serious softening was observed. (2) Overaging is associated with rapid initial hardening rate and with subsequent development of the nodules, which appeared as small semi-spheres or narrow bands at grain boundaries. (3) As aging proceeds the nodules spread into the matrix as well as along grain boundaries, then several nodules join together forming continuous net works around the grains. (4) At the advancing interface lamellar precipitates in the nodule are continuous with undercomposed matrix, but they break away from the matrix and sometimes spheroidize at the location apart from the interface.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (12), 777-781, 1960

    公益社団法人 日本金属学会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ