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納米氧化鑭增強(qiáng)Mo-Si-B合金多重強(qiáng)化效果分析
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西北有色金屬研究院,西安理工大學(xué)材料科學(xué)與工程學(xué)院,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院

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基金項(xiàng)目:

國家自然科學(xué)基金(51701162)；中國博士后科學(xué)基金(2016M602885)；陜西省博士后科研項(xiàng)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:

    結(jié)合機(jī)械合金化和熱壓燒結(jié)技術(shù)制備的多相Mo-12Si-8.5B合金是由鉬固溶體（α-Mo）和金屬間化合物（Mo3Si和Mo5SiB2）組成的復(fù)合材料。合金的微觀組織是Mo3Si和Mo5SiB2以顆粒形態(tài)彌散分布在具有連續(xù)結(jié)構(gòu)α-Mo基體的晶粒內(nèi)和晶界處。納米尺度的La2O3顆粒主要分布在Mo-12Si-8.5B合金中α-Mo相的晶粒內(nèi)，部分存在于Mo3Si和Mo5SiB2顆粒內(nèi)。納米La2O3顆粒的摻雜同時(shí)細(xì)化了α-Mo基體的晶粒和Mo3Si與Mo5SiB2相的顆粒從而使合金具有細(xì)小的微觀組織，合金內(nèi)α-Mo、Mo3Si和Mo5SiB2相的平均晶?；蝾w粒尺寸均小于1μm。結(jié)合微觀組織觀察及力學(xué)性能試驗(yàn)結(jié)果，對(duì)Mo-12Si-8.5B合金中存在的細(xì)晶強(qiáng)化、固溶強(qiáng)化和顆粒強(qiáng)化多重強(qiáng)化效果的耦合作用進(jìn)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,張國君,林小輝,李來平,張平祥.納米氧化鑭增強(qiáng)Mo-Si-B合金多重強(qiáng)化效果分析[J].稀有金屬材料與工程,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
  • 錄用日期:2018-02-09
  • 在線發(fā)布日期: 2018-06-08
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