Fabrication of textured Ti2AlC lamellar composites with improved mechanical properties. (1st February 2020)

• Record Type: Journal Article
• Authors: Xie, Xi; Yang, Rui; Cui, Yuyou; Jia, Qing; Bai, Chunguang
• Is Part Of: Journal of materials science & technology. Volume 38(2020)
• Page Start: 86
• Page End: 92
• Publication Date: 2020-02-01
• Subjects: MAXphase -- Ti2AlC -- Machinable ceramics -- Ceramic-matrix composites -- Reactive milling -- In-situ synthesis -- Nanocomposites -- Texture -- Lamellar microstructure; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2019.05.070
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: Textured Ti2 AlC lamellar composites have been successfully fabricated by a new method in the present work. The composites exhibit high compressive strength of ca 2 GPa, fracture toughness of 8.5 MPa m 1/2 (// c -axis), flexural strength of 735 MPa (// c -axis) and high hardness of 7.9 GPa (// c -axis). The strengthening mechanisms were discussed. The sintering and densification process was investigated and crystal orientation and microstructure were studied by electron backscattered diffraction techniques. The synthesis temperature is reduced to 1200 °C by using high surface-to-volume ratio Ti2 AlC nano flakes. The Lotgering orientation factor of Ti2 AlC and Ti3 AlC2 {00 l } planes in the textured top surface reaches 0.74 and 0.49, respectively. This new route may shed light on resolving the difficulties encountered in large scale fabrication of textured MAX phases.