ドープモリブデン線の粒組織と低温破断特性の関係 Relationship between Grain Structure and Low-temperature Fracture Characteristics in Doped-molybdenum Wire

この論文にアクセスする

この論文をさがす

著者

抄録

Molybdenum alloy wire doped with La<SUB>2</SUB>O<SUB>3</SUB> of 0.2% by mass was heated in hydrogen atmosphere at temperature between 1123 and 2473K, and subjected to three-point bend tests at temperature from liquid nitrogen temperature to room temperature. Then fracture surface of the specimen failed at liquid nitrogen temperature was examined by using a scanning electron microscope and crack initiation and propagation sites were determined. Finally relationship between fracture strength and ductility at low temperatures and grain stracture was discussed. In the present study the low-temperature fracture strength and ductility were represented by two parameters, critical stress and critical temperature, respectively.<BR>Results are summarized as follows.<BR>1) For the specimen mainly composed of fibrous structure;<BR>Critical stress decreased substantially and in contrast critical temperature increased slightly with the increase of heating temperature. Crack initiation site was the boundary transversing the fiber and then the crack propagated across the fibrous structure.<BR>2) For the specimen mainly composed of large and elongated grain structure;<BR>Critical stress was almost unchanged but critical temperature decreased though only slightly, with the increase of heating temperature. The crack initiation site was the boundary of a relatively small and equiaxed grain and then the crack propagated across the large and elongated grains.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(7), 913-917, 1996-07-15 

    Japan Society of Powder and Powder Metallurgy

参考文献:  9件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10002012684
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4004693
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
ページトップへ