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- 저자 : Akihisa Inoue (검색결과 18 건)
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( Akihisa Inoue ),( Hisamichi Kimura ),( Shin Ichi Yamaura ) 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 (σr) 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 σf 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, σf of the MQ Al(93)Ti4Fe3 alloy was 1320 MPa and the particle size and volume fraction were about II 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 (εp) of 4.5 %, Young`s modulus (E) of 85 GPa, Vickers hardness (Hv) of 192 and specific strength (σ(UTS)/Ρ) of 2.20×10(5)) Nm/kg at room temperature and σ(UTS) of 350 MPa, σ(0.2) of 330 MPa and εp 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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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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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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Shin, Hyung-Seop,Jeong, Young-Jin,Choi, Ho-Yeon,Inoue, Akihisa Elsevier 2007 Materials science & engineering. properties, micro Vol.449 No.-
<P><B>Abstract</B></P><P>The deformation behavior of a Zr<SUB>55</SUB>Al<SUB>10</SUB>Ni<SUB>5</SUB>Cu<SUB>30</SUB> (numbers indicate at.%) bulk metallic glass (BMG) under uniaxial tensile loading at different temperatures within the supercooled liquid region was investigated. The variations in the deformation behavior of few material, which resulted from the crystallization induced at low strain rates during testing is discussed. The Zr<SUB>55</SUB>Al<SUB>10</SUB>Ni<SUB>5</SUB>Cu<SUB>30</SUB> BMG showed either homogeneous or inhomogeneous deformation depending on the test conditions of initial strain rate and temperature adopted. It exhibited a maximum elongation of about 560% at the condition of 680K, 5×10<SUP>−4</SUP>s<SUP>−1</SUP>. The increase of the time elapsed during testing at 700 and 720K produced strain hardening due to crystallization at the later part of deformation. The onset of crystallization which occurred during the plastic deformation was accelerated as the initial strain rate increased. X-ray diffraction and hardness results confirmed the influence of the crystallization induced on the deformation behavior of Zr<SUB>55</SUB>Al<SUB>10</SUB>Ni<SUB>5</SUB>Cu<SUB>30</SUB> BMG.</P>
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