Effect of SiC Particulate Content on Stress-Strain Rate Relationship during Hot Compression of SiCp/7075Al Composites

賢司, 松木; 博明, 松本; 貢, 時澤; 則夫, 高辻; 光之, 磯貝; 哲, 村上

doi:10.2320/jinstmet1952.57.8_876

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“…452日本金属学会誌(2001) 第 65 巻高ひずみ速度側に移行し，変形応力は大きくなる傾向がある．また，低ひずみ速度領域における 34Al と TiC 複合材との変形応力の差は，顕著である．この領域での m 値の低下の理由としてはしきい応力 (s th )の存在11,12) が考えられるため，後で詳細に検討する． 3.3. 高温引張試験による延性評価高温圧縮試験の結果，TiC 粒子を添加した(g′ ＋b) 2 相ニッケルアルミナイドでは，10 -2 s -1 オーダーの高ひずみ速度領域において，m 値が 0.3 以上と高く，超塑性発現の可能性が示されている．このため，10TiC について，引張試験により，1273 K における延性を評価した結果を Fig.…”

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Grain Refinement and High Strain Rate Superplasticity in (γ′+β) Two Phase Nickel Aluminides Reinforced with TiC Particles

Doi

Matsuki²,

Akimoto³

et al. 2001

J.Japan Inst.Metals

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The fine grained Ni 3 Al (g′ )-NiAl (b) two-phase nickel aluminides reinforced with or without TiC particles were fabricated by a wet mechanical alloying and vacuum hot pressing process. The average grain sizes of the as-compacted intermetallics decreased from about 1.2 mm to about 0.4 mm with increasing in TiC volume fraction from 0 to 30. High temperature compression tests for these intermetallics were carried out at a temperature in a range of 1073 K-1273 K and at an initial strain rate in a range of 1.4×10-4 s -1 -5.6×10 -2 s -1 . Tensile tests were also performed at selected strain rates at 1273 K. In the log true stress-log strain rate curves for the nickel aluminides containing TiC particles, two strain rate regions showing low and high strain rate sensitivity exponents, m, (region I and II, respectively) were recognized, while the intermetallic without TiC showed only region II in this compression condition. At strain rates higher than about 10 -2 s -1 (region II) and at 1273 K, the value of m was larger than 0.32 for the nickel aluminides containing TiC particles. About 180 and 100 elongations were obtained for the nickel aluminides containing 0 and 10 vol.TiC, respectively, at a condition of 4.2×10 -2 s -1 and 1273 K. By the microstructure examinations using SEM and TEM, the occurrence of grain boundary sliding was observed in these nickel aluminides compressed at the strain rate of 1.4×10-2 s -1 and 1273 K. The threshold stress, s th , estimated by using an extrapolation method increased with increasing in the TiC content. Each double logarithmic plot of the strain rate and the effective stress, s e (＝s-s th ), can be approximated by a straight line with a slope of about 0.5 for the nickel aluminides containing TiC. This suggests that the superplasticity of the composites at the high strain rates can be explained by the grain boundary sliding model accommodated by dislocation slip. (Received January 19, 2001; Accepted March 21, 2001) Keywords: Ni 3 Al and NiAl two phase, TiC particle reinforcement, wet mechanical alloying, fine microstructure, high strain rate superplasticity, threshold stress

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Grain Refinement and High Strain Rate Superplasticity in (γ′+β) Two Phase Nickel Aluminides Reinforced with TiC Particles

Doi

Matsuki²,

Akimoto³

et al. 2001

J.Japan Inst.Metals

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Processing and superplastic properties of fine grained Si₃N₄/Al–Mg–Si composites

Mabuchi¹,

Iwasaki²,

Higashi³

et al. 1995

Materials Science and Technology

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Effect of SiC Particulate Content on Stress-Strain Rate Relationship during Hot Compression of SiCp/7075Al Composites

Cited by 2 publications

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Grain Refinement and High Strain Rate Superplasticity in (γ′+β) Two Phase Nickel Aluminides Reinforced with TiC Particles

Grain Refinement and High Strain Rate Superplasticity in (γ′+β) Two Phase Nickel Aluminides Reinforced with TiC Particles

Processing and superplastic properties of fine grained Si₃N₄/Al–Mg–Si composites

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Effect of SiC Particulate Content on Stress-Strain Rate Relationship during Hot Compression of SiCp/7075Al Composites

Cited by 2 publications

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Grain Refinement and High Strain Rate Superplasticity in (&gamma;&prime;+&beta;) Two Phase Nickel Aluminides Reinforced with TiC Particles

Grain Refinement and High Strain Rate Superplasticity in (&gamma;&prime;+&beta;) Two Phase Nickel Aluminides Reinforced with TiC Particles

Processing and superplastic properties of fine grained Si3N4/Al–Mg–Si composites

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Grain Refinement and High Strain Rate Superplasticity in (γ′+β) Two Phase Nickel Aluminides Reinforced with TiC Particles

Grain Refinement and High Strain Rate Superplasticity in (γ′+β) Two Phase Nickel Aluminides Reinforced with TiC Particles

Processing and superplastic properties of fine grained Si₃N₄/Al–Mg–Si composites