時間分解X線イメージングを利用した金属合金における固液共存体の引張および圧縮変形挙動のその場観察

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書誌事項

タイトル別名
  • <i>In Situ</i> Observations of Tensile and Compressive Deformations in Semi Solid Metallic Alloys Using Time-resolved X-ray Imaging
  • ジカン ブンカイ Xセン イメージング オ リヨウ シタ キンゾク ゴウキン ニ オケル コエキ キョウソンタイ ノ ヒッパリ オヨビ アッシュク ヘンケイ キョドウ ノ ソノ バ カンサツ
  • In situ observation of tensile and compressive deformation in semi solid metallic alloys using time-resolved imaging

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<p>Synchrotron X-ray radiography was used to study tensile and compressive deformations of semi solid Al-Cu and/or Fe-C alloys. In the case of tensile deformation of globular Al-Cu sample at ~60% solid, relatively high strain regions were formed even at mean strain of 0.005. The normal strain rate at the regions was 10 times as high as mean normal strain rate (3.45×10–3 s–1). At mean strain of 0.04, tensile deformation was localized in the high strain region, resulting in the formation of internal cracking in the plane normal to the tensile axis. On the other hand, in the case of compressive deformations of globular Al-Cu sample at ~55% solid and polygonal Fe-C sample at ~73% solid, shear bands with decreased solid fraction were formed at the domains tilted by approximately 45 degrees with respect to compressive plane. Rearrangement of solid particles including translation and rotation caused the shear induced dilation at the shear domains. Shear strain was localized at the shear domain with decreased solid fraction. Deformation of the polygonal solid particle of Fe-C sample caused a force to transmit over a longer distance than for the globular Al-Cu sample. Shear fracture finally occurred due to inadequate liquid flow into the expanding spaces between solid particles caused by shear-induced dilation. The solid/solid interaction including impingement between solid particles and rearrangement has significant role in the compressive deformation. These observations demonstrated that the mechanism of cracking formations induced by compressive deformation was totally different from that in the tensile deformation.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 103 (12), 668-677, 2017

    一般社団法人 日本鉄鋼協会

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