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Formation of Fine B2/����+��O Structure and Enhancement of Hardness in the Aged Ti2AlNb-Based Alloys Prepared by Spark Plasma Sintering

Journal Article


Abstract


  • Ti2AlNb-based alloys synthesized at 1223 K (950 ��C) by spark plasma sintering were aged at 973 K, 1023 K, 1073 K, and 1123 K (700����C, 750����C, 800 ��C, and 850����C), respectively. Phase composition, microstructure, and microhardness of the aged alloys were investigated in this study. Equiaxed O grains and Widmanst��tten B2/����+��O laths were formed in the aged alloys, and the microhardness was improved in contrast with the spark plasma-sintered alloy without aging. The microhardness relies largely on the O-phase content, as well as the length and width of the O laths. In particular, complete Widmanst��tten B2/����+��O laths, with locally finely dispersed �� precipitates, were obtained in the alloy aged at 1073 K (800 ��C), and the alloy exhibited the best microhardness performance. Such fine structure is due to the temperature-dependent transformations Oequiaxed���Oprimary��+��B2/��primary, Oprimary���Osecondary +��B2/��secondary, and B2/��primary���O.

Publication Date


  • 2017

Citation


  • Li, M., Cai, Q., Liu, Y., Ma, Z., Wang, Z., Huang, Y., & Li, H. (2017). Formation of Fine B2/����+��O Structure and Enhancement of Hardness in the Aged Ti2AlNb-Based Alloys Prepared by Spark Plasma Sintering. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 48(9), 4365-4371. doi:10.1007/s11661-017-4193-8

Scopus Eid


  • 2-s2.0-85021806709

Start Page


  • 4365

End Page


  • 4371

Volume


  • 48

Issue


  • 9

Place Of Publication


Abstract


  • Ti2AlNb-based alloys synthesized at 1223 K (950 ��C) by spark plasma sintering were aged at 973 K, 1023 K, 1073 K, and 1123 K (700����C, 750����C, 800 ��C, and 850����C), respectively. Phase composition, microstructure, and microhardness of the aged alloys were investigated in this study. Equiaxed O grains and Widmanst��tten B2/����+��O laths were formed in the aged alloys, and the microhardness was improved in contrast with the spark plasma-sintered alloy without aging. The microhardness relies largely on the O-phase content, as well as the length and width of the O laths. In particular, complete Widmanst��tten B2/����+��O laths, with locally finely dispersed �� precipitates, were obtained in the alloy aged at 1073 K (800 ��C), and the alloy exhibited the best microhardness performance. Such fine structure is due to the temperature-dependent transformations Oequiaxed���Oprimary��+��B2/��primary, Oprimary���Osecondary +��B2/��secondary, and B2/��primary���O.

Publication Date


  • 2017

Citation


  • Li, M., Cai, Q., Liu, Y., Ma, Z., Wang, Z., Huang, Y., & Li, H. (2017). Formation of Fine B2/����+��O Structure and Enhancement of Hardness in the Aged Ti2AlNb-Based Alloys Prepared by Spark Plasma Sintering. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 48(9), 4365-4371. doi:10.1007/s11661-017-4193-8

Scopus Eid


  • 2-s2.0-85021806709

Start Page


  • 4365

End Page


  • 4371

Volume


  • 48

Issue


  • 9

Place Of Publication