ＳｉＣ粒子強化超塑性Ｚｎ―Ａｌ合金板の張出し性に及ぼす背圧の影響

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タイトル別名
  • Effect of back pressure on the stretchability of SiC particulate reinforced superplastic Zn-Al alloy sheet.
  • SiC リュウシ キョウカ チョウソセイ Zn Al ゴウキンバン ノ ハリダ

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抄録

Superplastic Zn-Al alloy matrix composites reinforced with SiC particles of 20μm in diameter were produced by the hot-press process. The plastic forming of these composites was performed in a hydraulic bulging system. After bulging, the test piece was checked by the scanning electron microscopy (SEM). After superplastic forming, cavitation is observed at the interface between the matrix and SiC particles as well as at regions of agglomeration of SiC particles. On the test piece deformed without back pressure, cavitation occurs at the convex surface, especially around the top. The back pressure is confirmed to have the effect to reduce cavitation by the SEM exhibits observation. The test piece deformed at 2.5MPa back pressure an improved bulging limit by about 19% compared with the case of without back pressure. To employ back pressure in the deformation process is effect both to suppress the strain localization and to produce uniform strain distribution. The application of 2.5MPa back pressure in bulging, results in the increased fracture strength of composites at 250°C by about 22%. The high temperature strength becomes increased by the heat treatment to negate superplasticity after bulging.

収録刊行物

  • 軽金属

    軽金属 44 (9), 480-485, 1994

    一般社団法人 軽金属学会

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