기계적합금화한 (Al +12.5%Cu) 3 Zr 초미립 금속간화합물의 CIP 성형 및 소결 거동

문환균; 홍경태; 김선진; H.G. Moon; K.T. Hong; S.J. Kim

Korean Journal of Materials Research, Vol.12, No.8, 634-640, August, 2002

DOI10.3740/MRSK.2002.12.8.634 Export Citation

기계적합금화한 (Al +12.5%Cu) 3 Zr 초미립 금속간화합물의 CIP 성형 및 소결 거동

Cold Isostatic Pressing and Sintering Behavior of (Al +12.5%Cu) 3 Zr Nanocrystalline Intermetallic Compound Synthesized by Mechanical Alloying

문환균^†, 홍경태¹, 김선진

한양대학교 재료공학부
¹한국과학기술연구원 합금설계연구부

H.G. Moon^†, K.T. Hong¹, and S.J. Kim

Division of Materials Science and Engineering, Hanyang University, Seoul, Korea
¹Alloy Design Research Center, Korea Institute of Science and Technology, Seoul, Korea

E-mail:

To improve the ductility of mTEX> (Al+12.5 Ll_2,phaseformationandthebehaviorofthecoldisostaticpressandsinteringwereinvestigated.HowevermechanicallyalloyedA1 _3Zralloyhavebeenknowntohavehighmechanicalstrengthevenathightemperature,itsworkabilitywaspoor.Amethodofsolutionisrefinedgrainsizeandphasetransformationfrom DO_{23}to Ll_2. Ll_2structureTEX> (Al+12.5%Cu) Zr with nanocrystalline microstructure intermetallic powders where were prepared by mechanical alloying of elemental powders. Grain sizes of the as milled powders were less than 10nm (from transmission electron microscopy, TEM). Thermal analyses showed that Ll 2 structure was stable up to 800 ? C for 1hour (Al+12.5 (Al+12.5%Cu) Zr has been consolidated by cold isostatic pressing (CIP 138, 207, 276, 414MPa) at room temperature and subsequent heat treatment at high temperatures where Ll 2 structure was stable under vacuum atmosphere. The results showed that 94.2% density of Ll 2 compacts was obtained for the (Al +12.5%Cu) 3 Zr by sintering at 80 0 ? C for 1hour (under CIPed 207MPa). This compact of the grain size was 40nm.

Keywords:intermetallics;nanocrystalline;Ll 2 structure;cold isostatic pressing

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[Related Articles]

[1] Froes FH, Metal Power Reports, 59 (1989)

[2] Lu L, Lai MO : Mechanical Alloying, Kluwer acadenic publishers, p.84-108, (1998) (1998)

[3] Liu CT, Intermetallic Compounds, 2, 17 (1994)

[4] Frazier WE, Koczak MIJ, in Dispersion Strengthened Aluminum alloys, Kim YW, Griffith WMW, ends., p.573, (1988) (1988)

[5] Brringer R, Mater. Sci. Eng. A, 117, 33 (1989)

[6] Karek J, et al., Nature, 330, 556 (1987)

[7] Li ZG, Smith DJ, Appl. Phys. Lett., 55, 919 (1989)

[8] Raman A, Schubert K, Z. Metallkunde, 56, 40 (1965)

[9] Siegel RW, Fouger GE, Mat. Res. Soc. Symp. Proc., Grain Size Dependent Mechanical Properties in Nanophase Meterials, 362 (1995)

[10] Weiser MW, De Jomghe LC, J. Am. Ceram. Soc., 71, C125 (1995)

[11] Nordahl CS, Messing GL, J. Am. Ceram. Soc., 79(12), 3149 (1996)

[12] Ashby MF, Acta Metall, 22, 275 (1974)

[13] Swinkels FB, Ashby MF, Acta Metall., 29, 259 (1981)

[14] Williamson GK, Hall WH, Acta Metall., 3, 473 (1953)

[15] Yamaguchi M, Yamane T, Mat. Res. Soc. Symp. Proc., 81, 275 (1987)

[16] Hayashi K, Lin TW, Advances in Podwer Metallurgy and particulate Materials, Vol. 3, J. Capus and R. M German(eds.), Metal Power Industries Federation, Princeton, NJ, p.219 (1990) (1990)

[17] Pabi SK, Murty BS, Mater. Sci. Eng. A, 214, 146 (1996)

[18] Atzmon M, Physical review letters, 64(9), 487 (1990)

[19] Liao C, Chen YJ, Kear BH, Mayo WE 10, No. 6, pp.1063 (1998) (1998)

[20] Palmour H, Geho M, Russell RL, Hare TM, Sintering 91, Chaklader ACD, Lund JA, Trans Tech, Brookfield, VT, p.37 (1992) (1992)

[21] Mansour NAL, White J, Powder Met., 6, 108 (1963)

[22] Matsumura G, Tuan WS, Powder Met. Intern., 15, 188 (1983)

[23] Choi HS, Yoon YK, Park WK, Intern. J. Powder Met., 9, 23 (1973)

[24] Greskovichi C, Lay KW, J. Am. Ceram. Soc., 55(1), 142 (1972)

[25] Coble RL, J. Appl. Phy., 32, 787 (1961)

[26] Rhodes WH, J. Amer. Ceram. Soc., 64, 19 (1981)