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Multiple strengthening effects of Mo-Si-B alloy enhanced by nanoscale La2O3 particle
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Northwest Institute for Nonferrous Metal Research,Xi’an,School of Materials Science and Engineering,Xi’an University of Technology,Xi’an,Northwest Institute for Nonferrous Metal Research,Xi’an,Northwest Institute for Nonferrous Metal Research,Xi’an,Northwest Institute for Nonferrous Metal Research,Xi’an

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the National Natural Science Foundation of China;China Postdoctoral Science Foundation;the Shaaxi Postdoctoral Research Program

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    Abstract:

    Multi-phases Mo-Si-B alloy prepared using mechanical alloying (MA) followed by hot pressing is the composite material which consists of a ductile α-Mo solid solution and the high-strengthed Mo3Si and Mo5SiB2 intermetallics. The microstructure exhibits that the spherical Mo3Si and Mo5SiB2 particles distribute within the grain and along with the grain boundary of the continuous and uniform α-Mo matrix. Some nanoscale La2O3 particles also are mainly dispersed in the α-Mo grain and partially in the Mo3Si and Mo5SiB2 intermetallic particles. These La2O3 particles can refine the grain sizes or particle sizes of α-Mo matrix and intermetallic, which promotes the alloy to obtain a fine-grained microstructure. The average grain sizes or particle sizes of α-Mo, Mo3Si and Mo5SiB2 phases are only sub-microns in size. The strengthening mechanisms include fine grain strengthening, solution strengthening and particles strengthening are quantitatively analyzed, which combines the microstructure and the mechanical test results.

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[Li Bin, Zhang Guojun, Lin Xiaohui, Li Laiping, Zhang Pingxiang. Multiple strengthening effects of Mo-Si-B alloy enhanced by nanoscale La2O3 particle[J]. Rare Metal Materials and Engineering,2018,47(5):1529~1536.]
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History
  • Received:October 23,2017
  • Revised:November 24,2017
  • Adopted:February 09,2018
  • Online: June 08,2018
  • Published: