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RISS 인기검색어
- 검색키워드
- 저자 : Akihisa Inoue (검색결과 18 건)
- 무료
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New Aluminum-Based Amorphous Alloys with High Strength and Good Ductility
Inoue,Akihisa,Masumoto,Tsuyoshi 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.8
New Al-based amorphous alloys with high strength, good ductility and high corrosion resistance have been produced by liquid quenching in Al-Y-Ni and Al-La-Ni systems. The tensile fracture strength (σ_f) and Vickers hardness reach 1140 MPa and 300 DPN for Al_(87)Y_8Ni_5 and 1080 Mpa and 260 DPN for Al_(87)La_8Ni_5. The specific strengths, defined by the ratio of σ₁to density, are as high as 34 to 38, which is much higher than those for conventional alloy steels, Al-based alloys, and Ti-based alloys. These new Al-base amorphous alloys are effected to be used in many applications as a new type of high-strength material with low density and high corrosion resistance.
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Inoue, Akihisa,Kimura, Hisamichi,Yamaura, Shin-ichi 대한금속재료학회 2003 METALS AND MATERIALS International Vol.9 No.6
By the dispersion of nanoscale quasicrystalline and amorphous particles in Al phase, new Al-based alloys with good mechanical properties were developed in a high Al concentration range of 93-95 at.% for Al- Cr-Ce-Co, Al-V-Fe, Al-Ti-M and Al-Fe-Cr-Ti alloy systems. The Vickers hardness of a melt-quenched (MQ) Al_(84.6)Cr_(15.4) alloy with almost a single icosahedral quasicrystalline phase (QC) was 710. The addition of Ce and Co in the Al-Cr binary alloys was effective for the extension of the concentration range of the QC to a lower solute concentration range. The fracture strength (σ_(f)) increased to 1340 MPa for the MQ Al_(94.5)Cr₃Ce₁Co_(1.5) alloy in which the particle size and volume fraction were approximately 40 nm and 70 %, respectively. The σ_(f) of the MQ Al_(94)V₄Fe₂ alloy was 1390 MPa and the particle size and volume fraction were about 10 nm and 50 %, respectively. Similarly, σ_(f) of the MQ Al_(93)Ti₄Fe₃ alloy was 1320 MPa and the particle size and volume fraction were about 11 nm and 30 %, respectively. Powder metallurgy (P/M) Al_(93)Fe₃Cr₂Fe₂ alloy with dispersed nanoscale QC exhibited ultimate tensile strength (σ_(UTS)) of 660 MPa, 0.2 % proof stress (σ_(0.2)) of 550 MPa, plastic elongation (ε_(P)) of 4.5 %, Young's modulus (E) of 85 GPa, Vickers hardness (Hv) of 192 and specific strength (σ_(UTS)/ρ) of 2.20x10^(5) Nm/kg at room temperature and sUTS of 350 MPa, σ_(0.2) of 330 MPa and ε_(P) of 1.5 % at 573 K. The QC structure in the P/M Al_(93)Fe₃Cr₂Ti₂ alloy remained almost unchanged even after annealing for 720 ks at 573 K and good wear resistance against S50C steel was also maintained for the extruded alloy tested at sliding velocity of 0.5 to 2 m/sec. These mechanical properties are promising for the future extension of the new Al-based alloys to practical materials.
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분사주조법에 의한 al-Ni-Ce-Mg 계 비정질합금의 제조와 특성
정상명구,배차헌,정해용,하촌능인 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8
The optimum composition of Al-Ni-Ce-Mg alloys forming the amorphous and amorphous plus fcc-Al phase was investigated by the measurement of both hardness, maximum bending strain at fracture(ε_(Bf)), Differential Scanning Calorimetry(DSC) and X-ray diffraction for the as-quenched ribbons produced by melt-spinning. As a results, the alloy ribbon with optimum composition and a mixed phase was Al_(86)Ni_6Ce₄Mg₄. Al_(86)Ni_6Ce₄Mg₄ bulk alloy was produced by extrusion at different temperature of the rapidly solidified powders produced by helium gas atomization. The tensile strength and elongation at room temperature for Al_(86)Ni_6Ce₄Mg₄ bulk alloy extruded at 450℃ were 750MPa and 7.5%, respectively.
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Fujita Masashi,Kimura Hisamichi,Inoue Akihisa 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
New Al-based alloys with very high ultimate tensile strength were developed in high Al concentration range of 91-95 at.% for Al-Fe-Cr-Ti-M (M: Co and Mo) systems and Al-Fe-Cr-Mo-Ti-Co system by the dispersion of nanoscale quasicrystalline particles in Al phase. The effect of adding elements, M was discussed in the viewpoint of stability of super-cooled liquid state and formation ability of quasicrystalline phase. The P/M Al-Fe-Cr-Ti-M alloys with dispersed nanoscale quasicrystalline particles exhibited ultimate tensile strength of 350MPa at 573K and 200MPa at 673K.
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