Factors influencing the equilibrium grain size in equal-channel angular pressing: Role of Mg additions to aluminum

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0222-y· OSTI ID:669744

Iwahashi, Yoshinori; Horita, Zenji; Nemoto, Minoru ^[1]; Langdon, T G ^[2]

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1. Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science and Engineering
2. Univ. of Southern California, Los Angeles, CA (United States)

Experiments were undertaken to compare the equal-channel angular (ECA) pressing of Al-1% Mg and Al-3% Mg solid-solution alloys with pure Al. The results reveal both similarities and differences between these three materials. Bands of subgrains are formed in all three materials in a single passage through the die, and these subgrains subsequently evolve, on further pressings through the die, into an array of grains with high-angle boundaries. However, the addition of magnesium to an aluminum matrix decreases the rate of recovery and this leads, with an increasing Mg content, both to an increase in the number of pressings required to establish a homogeneous microstructure and to a decrease in the ultimate in the ultimate equiaxed equilibrium grain size. It is concluded that alloys exhibiting low rates of recovery should be especially attractive candidate materials for establishing ultrafine structures through grain refinement using the ECA pressing technique.

• Sponsoring Organization: USDOE
• OSTI ID: 669744
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 29; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM BASE ALLOYS
EQUILIBRIUM
GRAIN SIZE
MAGNESIUM ALLOYS
METALLURGICAL EFFECTS
PRESSING
SOLID SOLUTIONS