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Fatigue Strength and Fracture Mechanisms in Intermetllic Compound Particlate-Reinforced

Research Project

Project/Area Number06650081
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionIWATE UNIVERSITY

Principal Investigator

KATAGIRI Kazumune  IWATE UNIV., Faculty of Eng., Professor, 工学部, 教授 (90029893)

Co-Investigator(Kenkyū-buntansha) KASABA Koichi  IWATE UNIV., Faculty of Eng., Assist.Prof., 工学部, 助手 (00271841)
SHIN Hyung-seop  IWATE UNIV., Faculty of Eng., Lecture, 工学部, 講師 (20240658)
SATO Tadashi  IWATE UNIV., Faculty of Eng., Assoc., Prof., 工学部, 助教授 (30003859)
Project Period (FY) 1994 – 1995
Project Status Completed(Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost : ¥1,900,000)
Fiscal Year 1995 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1994 : ¥1,300,000 (Direct Cost : ¥1,300,000)
KeywordsFatigue Strength / Fatigue Crack Propagation / Variable Stressing / Elevated Temperature / Metal Matrix Composites / Die Casting / NiAl Particle / Ni_3Al Particle / アルミニウム合金 / 体積分率 / 空洞 / 析出物
Research Abstract

Through the evaluation on static mechanical properties and fatigue characteristics as well as the microscopiic observations, it has been revealed that the intermetalic compund, NiAl and Ni_3Al, particle-reinforced Al die cast are superior to the SiC reinforced one as is shown in the followings.
1. The endurance limit increases by reinforcement at room temperature. While the endurance limit ofmatrix die cast and SiC particle reinforced one decrease with temperature rise, reinforcement is effective at 200゚C in the NiAl and up to 300゚C in Ni_3Al particle. The endurance limit and fatigue life-time increase with increase in the particle volume fraction in all temperature ranges examined. Although these characteristics basically corresponds to that of 0.2% proof stress, suppression of local slip by the intermetalic compound particles together with precipitates such as Al_3Ni significantly contribute the fatigue strength at low stress.
2. Fatigue crack initiates at voids located near the surfac … More e which are introduced on casting in all die casts. Crack propagates through the matrix and along the particle-matrix interface, and the former is dominant at elevated temperatures. No cracking in Ni_3Al particle is found.
3. Fatigue crack propagation resistance of 2.5 vol% NiAl particle reinforced die cast is higher at near threshold region than the matrix and SiC reinforced one. It decreases when the particle volumefraction increase beyond 2.5%. In the crack propagation rate range of Paris rule or beyond it, 2.5 vol% NiAl particle reinforced die cast has higher crack propagation resistance while SiC has such low resistance as that in the matrix : These characteristics dose not coinside with that of fracture toughness.
4. NiAl particle reinforce die cast has excellent fatigue characteristics against the two stage (low-high and high low) varying stress fatigue. Acceleration of fatigue crack propagation under intermittent oversrtressing and its microscopic mechanism in the intermetalic compound particle reinforced die cast is open problem. Less

Report

(3results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report

Research Products

(6results)

All Other

All Publications

  • [Publications] 申 亨すぐ: "粒子強化アルミ合金ダイカストの室温・高温疲労強度特性" 日本機械学会論文集(A編). 61. 2572-2577 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hyung-Seop SHIN: "Fracture Toughness of Particulate Reinforces Die-Cast Aluminium Alloy Composites" Proc. Asian Pacific Conference for Fracture and Strength '96 to be held at Kyungju. (掲載予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hyung-Seop SHIN: "Fatigue Strength of Particulate-forced Die-Cast Aluminium Alloy Composites at Room and Elevated Temperatures" Trans.of the Japan Soc.of Mech.Eng.Vol.61, No.592. 2572-2577 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hyung-Seop SHIN: "Fracture Toughness of Particulate Reinforced Die-Cast Aluminium Alloy Composites" Proc.Asian Pacific Conference for Fracture and Strength '96, to be held at Kyungju July 23-26.(Accepted.). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 申 亨燮: "粒子強化アルミ合金ダイカストの室温・高温疲労強度特性" 日本機械学会論文集(A編). 61. 2572-2577 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Hyung-Seop SHIN: "Fracture Toughness of Particulate Reinforced Die-Cast Aluminium Alloy Composites." Proc.Asian Pacific Conference for Fracture and Strength ‘96,to be held at Kyungju.(掲載予定).

    • Related Report
      1995 Annual Research Report

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Published : 1994-04-01   Modified : 2016-04-21  

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