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Materials 2016, 9(3), 189; doi:10.3390/ma9030189

Thermal Mechanical Processing Effects on Microstructure Evolution and Mechanical Properties of the Sintered Ti-22Al-25Nb Alloy

1
School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2
Department of Mechanical Engineering, Nanchang Vocation College, Nanchang 330004, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Received: 4 January 2016 / Revised: 26 February 2016 / Accepted: 29 February 2016 / Published: 11 March 2016
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Abstract

This work illustrates the effect of thermal mechanical processing parameters on the microstructure and mechanical properties of the Ti-22Al-25Nb alloy prepared by reactive sintering with element powders, consisting of O, B2 and Ti3Al phases. Tensile and plane strain fracture toughness tests were carried out at room temperature to understand the mechanical behavior of the alloys and its correlation with the microstructural features characterized by scanning and transmission electron microscopy. The results show that the increased tensile strength (from 340 to 500 MPa) and elongation (from 3.6% to 4.2%) is due to the presence of lamellar O/B2 colony and needle-like O phase in B2 matrix in the as-processed Ti-22Al-25Nb alloys, as compared to the coarse lath O adjacent to B2 in the sintered alloys. Changes in morphologies of O phase improve the fracture toughness (KIC) of the sintered alloys from 7 to 15 MPa·m−1/2. Additionally, the fracture mechanism shifts from cleavage fracture in the as-sintered alloys to quasi-cleavage fracture in the as-processed alloys. View Full-Text
Keywords: Ti-22Al-25Nb alloy; thermal mechanical processing; mechanical properties; fracture mechanism Ti-22Al-25Nb alloy; thermal mechanical processing; mechanical properties; fracture mechanism
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, Y.; Lu, Z.; Zhang, K.; Zhang, D. Thermal Mechanical Processing Effects on Microstructure Evolution and Mechanical Properties of the Sintered Ti-22Al-25Nb Alloy. Materials 2016, 9, 189.

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