TY - JOUR
T1 - Microscopic properties of long-period ordering in Al-Rich TiAl alloys
AU - Hata, S.
AU - Nakano, T.
AU - Kuwano, N.
AU - Itakura, M.
AU - Matsumura, S.
AU - Umakoshi, Y.
N1 - Funding Information:
The authors thank Dr. U.D. Kulkarni (Bhabha Atomic Research Centre, Mumbai, India) for his valuable comments. This work was partly supported by the Grant-in-Aid for Young Scientists (Grant No. 18681019) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT).
PY - 2008/7
Y1 - 2008/7
N2 - The ordering mechanism of long-period superstructures (LPSs) in Al-rich TiAl alloys has been investigated by high-resolution transmission electron microscopy (HRTEM). The LPSs are classified in terms of arrangements of base clusters with different shapes and compositions formed in Ti-rich (002) layers of L 10-TiAl matrix: square Ti4Al, fat rhombus Ti3Al, and lean rhombus Ti2Al type clusters. The HRTEM observations revealed that antiphase boundaries of long-range-ordered LPS domains and short-range-ordered microdomains are constructed by various space-filling arrangements of the base clusters. Such a microscopic property characterized by the base clusters and their arrangements is markedly analogous to that of the 〈1,1/2,0〉* special-point ordering alloys such as Ni-Mo.
AB - The ordering mechanism of long-period superstructures (LPSs) in Al-rich TiAl alloys has been investigated by high-resolution transmission electron microscopy (HRTEM). The LPSs are classified in terms of arrangements of base clusters with different shapes and compositions formed in Ti-rich (002) layers of L 10-TiAl matrix: square Ti4Al, fat rhombus Ti3Al, and lean rhombus Ti2Al type clusters. The HRTEM observations revealed that antiphase boundaries of long-range-ordered LPS domains and short-range-ordered microdomains are constructed by various space-filling arrangements of the base clusters. Such a microscopic property characterized by the base clusters and their arrangements is markedly analogous to that of the 〈1,1/2,0〉* special-point ordering alloys such as Ni-Mo.
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U2 - 10.1007/s11661-007-9397-x
DO - 10.1007/s11661-007-9397-x
M3 - Article
AN - SCOPUS:44549086938
SN - 1073-5623
VL - 39
SP - 1610
EP - 1617
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 7
ER -