Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

Shili Shu; Cunzhu Tong; Feng Qiu; Qichuan Jiang

doi:10.1186/s40064-015-1575-5

Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

Springerplus. 2015 Dec 18:4:784. doi: 10.1186/s40064-015-1575-5. eCollection 2015.

Authors

Shili Shu¹, Cunzhu Tong², Feng Qiu³, Qichuan Jiang⁴

Affiliations

¹ Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130025 People's Republic of China ; State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130012 People's Republic of China.
² State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130012 People's Republic of China.
³ Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130025 People's Republic of China ; Department of Mechanical Engineering, Oakland University, Rochester, MI 48309 USA.
⁴ Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130025 People's Republic of China.

Abstract

The element of Fe can enhance the strength of TiB2/TiAl composite, but it is detrimental to the ductility of the composite due to the existence of large bulk TiB2 phase at grain boundary. The element of Mn is beneficial to the ductility of TiB2/TiAl composite, of which the fracture strain increases from 15.9 to 17.9 % with the addition of 2 at.% Mn. The element of Co can improve the strength and ductility of TiB2/TiAl composite simultaneously. With the addition of 2 at.% Co, the ultimate compression strength of TiB2/TiAl composite increases from 1829 to 1906 MPa and the fracture strain increases from 15.9 to 17.2 %.

Keywords: Alloying element; Composite; Compression properties; TiAl.