高军, 鲁世强, 邓莉萍, 虞文. B4C对Nb-NbCr2合金热稳定性的影响研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(1): 7-13. DOI: 10.3969/j.issn.1001-4926.2017.01.002
引用本文: 高军, 鲁世强, 邓莉萍, 虞文. B4C对Nb-NbCr2合金热稳定性的影响研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(1): 7-13. DOI: 10.3969/j.issn.1001-4926.2017.01.002
GAO Jun, LU Shi-qiang, DENG Li-ping, YU Wen. Effect of B4C on Thermal Stability of Nb-NbCr2 Alloy[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(1): 7-13. DOI: 10.3969/j.issn.1001-4926.2017.01.002
Citation: GAO Jun, LU Shi-qiang, DENG Li-ping, YU Wen. Effect of B4C on Thermal Stability of Nb-NbCr2 Alloy[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(1): 7-13. DOI: 10.3969/j.issn.1001-4926.2017.01.002

B4C对Nb-NbCr2合金热稳定性的影响研究

Effect of B4C on Thermal Stability of Nb-NbCr2 Alloy

  • 摘要: 采用机械合金化和热压工艺制备添加原子分数为0.5% B4C的Nb-NbCr2合金,在1 200℃对其分别进行30~100 h的真空热暴露实验,研究B4C对Nb-NbCr2合金热稳定性的影响。结果表明,热暴露后的B4C/Nb-NbCr2合金未发生明显的物相变化;热暴露100 h后的致密度从98.6%升高至98.7%,其变化幅度明显小于未添加B4C的合金;热暴露后的Laves相NbCr2颗粒存在少许聚集长大现象,但比未添加B4C的合金的聚集长大现象要轻微许多;热暴露50 h和100 h后的维氏硬度与热暴露前相比分别下降10.1%和1.7%,但其变化幅度明显较小未添加B4C的合金;热暴露100 h后的抗压强度和塑性应变分别由热暴露前的3 048 MPa和12.7%变化至2 788 MPa和20.7%,其变化幅度要小于未添加B4C的合金。添加B4C颗粒可在一定程度上提高Nb-NbCr2合金的热稳定性。

     

    Abstract: The Nb-NbCr2 alloy with 0.5at.% B4C was prepared by mechanical alloying and hot pressing. To investigate the effects of B4C on thermal stability of Nb-NbCr2 alloy, the samples were thermally exposed at 1 200℃ for 30~100 h in vacuum, respectively. The results show that composition phases of B4C/Nb-NbCr2 alloy have no obvious change after the thermal exposure process. The relative density of B4C/Nb-NbCr2 alloy increases from 98.6% to 98.7% and the change is significantly smaller than Nb-NbCr2 alloy without B4C addition. Laves phase NbCr2 particles of B4C/Nb-NbCr2 alloy have a little aggregation and growth after the thermal exposure process, but the phenomenon of aggregation and growth of Laves phase NbCr2 particles is much less than Nb-NbCr2 alloy without B4C addition. After thermal exposure for 50 h, the Vickers hardness of B4C/Nb-NbCr2 decreases by 10.1% after the first 50 h and decreases by only 1.7% after the later 50 h, and the change is significantly smaller than Nb-NbCr2 alloy without B4C addition. After thermal exposure for 100 h, the compressive strength and plastic strain of B4C/Nb-NbCr2 alloy change from 3 048 MPa and 12.7% to 2 788 MPa and 20.7%, respectively, and the change is significantly smaller than Nb-NbCr2 alloy without B4C addition. In general, it can be seen that the B4C particles can improve the thermal stability of Nb-NbCr2 alloy.

     

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