ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In order to improve the high-temperature strength of an Al-Cu-Mg alloy, Mn was added atsupersaturation 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 theQ 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 obtainedwas of the Al-Cu-Mg-(Zn) system, age-hardening occurred by formation of a GPB zone at roomtemperature and 448 K. At the peak level of age-hardening at room temperature, the tensile strengthat room temperature was 704 MPa, and the elongations were 8.0%. The high temperature strengths at523 and 573 K were 319 and 141 MPa, respectively, and the elongations were 17 and 34%,respectively
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.419.pdf
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