Li, S. J. and Zhang, Y. W. and Sun, B. B. and Hao, Y. L. and Yang, R. (2008) Thermal stability and mechanical properties of nanostructured Ti-24Nb-4Zr-7.9Sn alloy. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 480 (1-2). pp. 101-108.
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Thermal stability of the nanostructured grains of cold-rolled Ti-24Nb-4Zr-7.9Sn alloy and corresponding variations in mechanical properties were investigated. The activation energy for grain growth was found distinct below and above the (a + beta)/beta transus of similar to 950 K, with values of similar to 47 and similar to 206 kJ/mol, respectively. Due to the pinning effect of the a precipitates at P grain boundaries, grains sizes can be maintained at less than 100 nm during prolonged annealing at temperatures up to 773 K, and are less than 1 mu m for annealing temperature up to 923 K and time up to 2 h. Annealing above the P transus resulted in coarse grains with sizes of tens of micrometers in less than 2 h. Tensile and hardness tests showed rapid strengthening with the increase of annealing time below 773 K, which was attributed to both the rapid formation of nano-sized a precipitates and the slow growth rate of P grains. By adjusting the grain size of the cold-rolled material the high strength/low Young's modulus match desirable for implant applications can be improved over the hot-rolled bars with coarse grains. (c) 2007 Published by Elsevier B.V.
|Uncontrolled Keywords:||mechanical properties; thermal stability; nanostructuring; titanium alloy|
|Subjects:||Material Science > Functional and hybrid materials|
|Deposited On:||03 Sep 2009 17:06|
|Last Modified:||03 Sep 2009 17:06|
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