The effect of coarse second phase particles on fatigue crack propagation of an Al-Zn-Mg-Cu alloy

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90230-5· OSTI ID:7114901

Guerbuez, R; Alpay, S P ^[1]

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1. Middle East Technical Univ., Ankara (Turkey). Dept. of Metallurgical Engineering

The objective of this study is to determine the role of the most commonly observed coarse second phase particles; Al[sub 7]Cu[sub 2]Fe, Mg[sub 2]Si and CuAl[sub 2]Mg on the Stage 2 fatigue crack propagation of a 7050 aluminum alloy. The differences in the composition of this alloy when compared to the conventional 7075 alloy are: (1) increased Cu content for additional strengthening during aging and for increasing the temperature range of GP zone stability; (2) replacement of Cr by Zr to reduce quench sensitivity; (3) reduced Fe and Si contents to improve fracture toughness which, however, decreases fatigue crack growth threshold, [Delta]K[sub th], slightly; and (4) increased Zn content for strengthening.

• OSTI ID: 7114901
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 30:11; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
CRACK PROPAGATION
FATIGUE
COPPER ALLOYS
MAGNESIUM ALLOYS
ZINC ALLOYS
CHEMICAL COMPOSITION
MICROSTRUCTURE
ZIRCONIUM ADDITIONS
ALLOYS
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
ZIRCONIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties