Mechanical Behavior of an Al–Mg–Mn–Sc Alloy with an Ultrafine Grain Structure at Cryogenic Temperatures1. Issue 12 (30th April 2015)

• Record Type: Journal Article
• Authors: Zhemchuzhnikova, Daria; Kaibyshev, Rustam
• Is Part Of: Advanced engineering materials. Volume 17:Issue 12(2015:Dec.)
• Page Start: 1804
• Page End: 1811
• Publication Date: 2015-04-30
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201500138
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The mechanical properties of an Al–Mg–Mn–Sc alloy with a grain size of ≈0.7 μm were examined at temperatures ranging from 77 to 293 K. An ultrafine grain structure was produced by equal‐channel angular pressing at 593 K up to a total strain of ≈12. It was demonstrated that extensive grain refinement enhances strength and ductility at ambient and cryogenic temperatures and highly enhances fracture toughness at room temperature. The alloy exhibits a well‐defined ductile–brittle transition attributed to the influence of temperature on nucleation and the growth of microvoids. Abstract : In this paper, the effect of a grain size of an Al–Mg–Mn–Sc alloy on the mechanical and fracture behavior at temperatures ranging from 77 to 293 K was examined. It is shown that the ductility of the alloy with the fine grain structure increases with decreasing temperature due to an increase in the strain‐hardening rate.