TY - JOUR
T1 - Factors influencing the equilibrium grain size in equal-channel angular pressing
T2 - Role of Mg additions to aluminum
AU - Iwahashi, Yoshinori
AU - Horita, Zenji
AU - Nemoto, Minoru
AU - Langdon, Terence G.
N1 - Funding Information:
We are grateful to Mr. Moritaka Hiroshige (Nishiki Tekko Co., Kurume, Fukuoka, Japan) for fabricating the ECA pressing die with a single circular channel. This work was supported in part by the Light Metals Educational Foundation of Japan, in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan, in part by the Japan Society for the Promotion of Science, and in part by the National Science Foundation of the United States under Grant Nos. DMR-9625969 and INT-9602919.
PY - 1998
Y1 - 1998
N2 - Experiments were undertaken to compare the equal-channel angular (ECA) pressing of Al-1 pet Mg and Al-3 pet 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 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.
AB - Experiments were undertaken to compare the equal-channel angular (ECA) pressing of Al-1 pet Mg and Al-3 pet 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 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.
UR - http://www.scopus.com/inward/record.url?scp=0032179148&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032179148&partnerID=8YFLogxK
U2 - 10.1007/s11661-998-0222-y
DO - 10.1007/s11661-998-0222-y
M3 - Article
AN - SCOPUS:0032179148
SN - 1073-5623
VL - 29
SP - 2503
EP - 2510
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 10
ER -