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纳米氧化镧增强Mo-Si-B合金多重强化效果分析
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西北有色金属研究院,西安理工大学材料科学与工程学院,西北有色金属研究院,西北有色金属研究院,西北有色金属研究院

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国家自然科学基金(51701162);中国博士后科学基金(2016M602885);陕西省博士后科研项目(2016BSHEDZZ07)


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

Fund Project:

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

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    摘要:

    结合机械合金化和热压烧结技术制备的多相Mo-12Si-8.5B合金是由钼固溶体(α-Mo)和金属间化合物(Mo3Si和Mo5SiB2)组成的复合材料。合金的微观组织是Mo3Si和Mo5SiB2以颗粒形态弥散分布在具有连续结构α-Mo基体的晶粒内和晶界处。纳米尺度的La2O3颗粒主要分布在Mo-12Si-8.5B合金中α-Mo相的晶粒内,部分存在于Mo3Si和Mo5SiB2颗粒内。纳米La2O3颗粒的掺杂同时细化了α-Mo基体的晶粒和Mo3Si与Mo5SiB2相的颗粒从而使合金具有细小的微观组织,合金内α-Mo、Mo3Si和Mo5SiB2相的平均晶粒或颗粒尺寸均小于1μm。结合微观组织观察及力学性能试验结果,对Mo-12Si-8.5B合金中存在的细晶强化、固溶强化和颗粒强化多重强化效果的耦合作用进行了量化分析。

    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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李斌,张国君,林小辉,李来平,张平祥.纳米氧化镧增强Mo-Si-B合金多重强化效果分析[J].稀有金属材料与工程,2018,47(5):1529~1536.[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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  • 收稿日期:2017-10-23
  • 最后修改日期:2017-11-24
  • 录用日期:2018-02-09
  • 在线发布日期: 2018-06-08
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