The Tensile Mechanical Properties of Thermomechanically Consolidated Titanium at Different Strain Rates

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• 作者：Cun Liang ; Mingxing Ma ; Mingtu Jia…
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：46
• 期：11
• 页码：5095-5102
• 全文大小：2,727 KB
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• 作者单位：Cun Liang (1)
  Mingxing Ma (1) (3)
  Mingtu Jia (2)
  Stiliana Raynova (2)
  Jianqiang Yan (1)
  Deliang Zhang (1)
  
  1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
  3. Central China Institute of Technology, Zhengzhou, China
  2. Waikato Center for Advanced Materials, School of Engineering, University of Waikato, Hamilton, New Zealand
  
• 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

The microstructures, tensile mechanical properties, and fracture behavior of a commercially pure (CP) titanium disk (called PF/Ti disk) and a CP titanium bar (called PE/Ti bar) made by powder compact forging (PCF) and powder compact extrusion (PCE) respectively have been studied. With increasing the strain rate from 10? to 10? s?, the yield strength of the PF/Ti disk and PE/Ti bar increased from 708 to 811 MPa and from 672 to 764 MPa, respectively; their UTS increased from 824 to 1009 MPa and from 809 to 926 MPa, respectively, and their elongation to fracture decreased from 21 to 8 pct and from 25 to 17.8 pct, respectively. With a low strain rate of 10? s?, the PF/Ti disk did not show any cavities at unbonded or weakly bonded interparticle boundaries, but the PE/Ti bar showed a small number of cavities with sizes of around 1 μm. With a high strain rate of 10? s?, the PF/Ti disk showed a small number of cavities with sizes in the range of 0.1 to 0.5 μm, while for the PE/Ti bar, the cavities grew into microcracks of up to 20 μm long. The findings suggest that close to 100 pct of consolidation is rapidly achieved by PCF at 1573 K (1300 °C) and PCE at 1523 K (1250 °C), respectively, possibly due to the dissolution of the particle oxide surface films during heating and rapid diffusion bonding between the fresh particle surfaces during PCF and PCE. Manuscript submitted November 15, 2014.