Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature

Abstract:

Article Preview

In order to improve the high-temperature strength of an Al-Cu-Mg alloy, Mn was added at supersaturation to form a high-density dispersion of an intermetallic phase. In the P/M Al-3.6Mn- 6.4Cu-3.6Zn-1.7Mg alloy (mass%), rod-like Al-Mn-Cu-Zn quaternary intermetallic phases (Q phase) several hundred nanometers in length were dispersed in the matrix. The chemical composition of the Q phase was determined by TEM/EDX to be 78.8Al-12Mn-8Cu-1.2Zn (at%). The crystal system, space group, and lattice parameters of the unit cell were identified to be orthorhombic, Cmcm and a = 0.76, b = 2.11, c = 1.25 nm, respectively, by Rietveld analysis. Since the matrix of the alloy obtained was of the Al-Cu-Mg-(Zn) system, age-hardening occurred by formation of a GPB zone at room temperature and 448 K. At the peak level of age-hardening at room temperature, the tensile strength at room temperature was 704 MPa, and the elongations were 8.0%. The high temperature strengths at 523 and 573 K were 319 and 141 MPa, respectively, and the elongations were 17 and 34%, respectively.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

419-424

DOI:

10.4028/www.scientific.net/MSF.519-521.419

Citation:

H. Adachi et al., "Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature", Materials Science Forum, Vols. 519-521, pp. 419-424, 2006

Online since:

July 2006

Export:

Price:

$35.00

[1] W. M. Griffith, R.E. Sanders, Jr. and G. J. Hildeman: TMS-AIME, (1984), p.209.

[2] H. Shimizu, K. Osamura, H. Adachi, J. Kusui and K. Kikuchi: J. JILM Vol. 54 (2004), P2.

[3] H. Adachi, K. Osamura, T. Tanahashi, K. Kikuchi and J. Kusui: J. JILM Vol. 55 (2005), P164.

[4] F. Izumi and T. Ikeda: Mater. Sci. Forum Vol. 321-324 (1999), P198.

[5] A. Damjanovic: Acta. Cryst. Vol. 14 (1961), P982.

[6] W. Köster and T. Gödecke: Z. Metallkde. Vol. 57 (1966), P889.

[7] T. Takahashi and T. Sato: J. JILM Vol. 35 (1985), P41.

In order to see related information, you need to Login.