1. Step Reactive Sintering of Ti2AlNb Based Alloy with Element Powders
- Author
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Kai Feng Zhang, Lu Zhen, and Yuan Xin Wang
- Subjects
Two temperature ,Materials science ,Sintered alloy ,Alloy ,Metallurgy ,General Engineering ,engineering ,Sintering ,Orthorhombic crystal system ,engineering.material ,Microstructure ,Hot pressing ,Homogenization (chemistry) - Abstract
As a new effort, combined reactive sintering with hot pressing technique, the Ti-22Al-25Nb alloy was successful prepared with element mixed powders. Meanwhile, the reactive sintering was divided into two temperature ranges, which were at 873 K and 1373 K, respectively. The starting sintering kept 1h at 873K, and then the temperature was increased to 1373K, keeping 2h. The orthorhombic (Ti2AlNb) phase was observed in this sintered alloy. Moreover, the homogenization treat was conducted at 1473 K for 2h after the final sintering was accomplished, and the fraction of the orthorhombic phase increased significantly. The microstructures and the phases were analyzed. And the generation mechanism of the orthorhombic phase was also analyzed.
- Published
- 2013