Tensile and Fatigue Strengths of SCS-6/Ti-6Al-4V Titanium Matrix Composite by Spark Plasma Sintering

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  • Izui Hiroshi
    Dept. Aerospace Eng., College of Science and Technology, Nihon University
  • Kinbara So
    Graduate School of Science & Technology, Nihon University
  • Okano Michiharu
    Dept. Mech. Eng., College of Science and Technology, Nihon University

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Other Title
  • 放電プラズマ焼結法によるＳＣＳ‐６／Ｔｉ‐６Ａｌ‐４Ｖ複合材料の引張および疲労強度
  • 放電プラズマ焼結法によるSCS-6/Ti-6Al-4V複合材料の引張および疲労強度
  • ホウデン プラズマ ショウケツホウ ニ ヨル SCS 6 Ti 6Al 4V フクゴウ ザイリョウ ノ ヒッパリ オヨビ ヒロウ キョウド

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Abstract

This study was undertaken to investigate the effect of spark plasma sintering (SPS) on the tensile and fatigue properties of laminates of SCS-6 SiC fiber-reinforced Ti-6Al-4V titanium matrix composites (TMC). The Ti-6Al-4V matrix and SCS-6 fiber mat were consolidated by spark plasma sintering at the temperature of 800, 900, and 1000°C and at the pressures of 30 and 60 MPa in vacuum. Tensile specimens of TMC were tested at room temperature, 400, 600, and 800°C. In addition, tensile properties of TMC were experimentally evaluated with 11 to 33% volume fraction of SCS-6. Fatigue tests of TMC were carried out at room temperature and 600°C. Specimens were examined after tensile and fatigue tests using SEM to characterize the fracture surface morphology. The fiber/matrix interactions were analyzed by energy dispersive x-ray spectroscopy (EDS).<br>TMC consolidated at 900°C and 60 MPa showed the highest strengths of 857 to 1679 MPa from room temperature to 800°C. The tensile strengths of TMC with volume fraction of fiber varied from 11 to 27% are approximately equal to the theoretical obtained from the rule-of-mixture model. TMC can sustain tensile stress level at or below 450 MPa at 600°C without fracture after more than 107 cycles.

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