Microstructures and Tensile Mechanical Properties of Titanium Rods Made by Powder Compact Extrusion of a Titanium Hydride Powder

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• 作者：Yifeng Zheng ; Xun Yao ; Jiamiao Liang…
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：47
• 期：4
• 页码：1842-1853
• 全文大小：3,793 KB
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• 作者单位：Yifeng Zheng (1)
  Xun Yao (1)
  Jiamiao Liang (1)
  Deliang Zhang (1)
  
  1. State Key Laboratory for Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Structural Materials
  Physical Chemistry
  Ceramics,Glass,Composites,Natural Materials
  
• 出版者：Springer Boston
• ISSN：1543-1940

文摘

Nearly fully dense titanium with good mechanical properties was fabricated rapidly by induction heating, holding, and hot extrusion of the TiH₂ powder compacts. The dehydrogenation and consolidation processes took less than 15 minutes in total. The microstructures, contents of interstitial elements (H, O), tensile mechanical properties, and fracture behaviors of titanium samples made with different holding and extrusion temperatures [1273 K, 1373 K, and 1473 K (1000 °C, 1100 °C, and 1200 °C)] were investigated. The results showed that the hydrogen content in the extruded rods was around 0.09 wt pct when the holding and extrusion temperature was 1373 K or 1473 K (1100 °C or 1200 °C), with almost all of the TiH₂ phase being transformed into Ti phase during the heating, holding, and extrusion process steps. The extruded Ti samples had a lamellar structure consisting of fine α lamellae with random orientations in different lamellar colonies and the relative density of all the extruded samples exceeded 99.5 pct. The residual TiH₂ phase can reduce the ductility of extruded rods. The sample extruded at 1373 K (1100 °C) has the best elongation to fracture of 21.0 pct, and its average yield strength and ultimate tensile strength reached 536.8 and 691.8 MPa, respectively.