合金元素Hf, Sn, Ta, Zr, Dy和Ho对Nb-Nb5Si3合金组织和力学性能的影响*
EFFECT OF Hf, Sn, Ta, Zr, Dy AND Ho ON MICRO- STRUCTURE AND MECHANICAL PROPERTIES OF Nb-Nb5Si3 ALLOY
Accepted date: 2015-01-29
Online published: 2015-03-25
综合评述了作者几年来先后完成的Hf含量对Ni-16Si, Hf和Sn对Ni-20Ti-5Cr-3Al-18Si, Zr含量对Ni-22Ti-16Si, Ta含量对Nb-22Ti-16Si-7Cr-3Al和稀土元素Dy和Ho对Ni-23Ti-10Ta-2Cr-18Si和Ni-22Ti-16Si-7Cr-3Al-3Ta-2Hf等合金组织结构和力学性能影响的研究工作. 合金元素Hf, Zr, Sn+Hf, Ta, Dy和Ho加入Nb-Si二元系或多元系合金, 明显提高其室温和高温屈服强度和塑性以及断裂韧性. 强度的提高与合金元素的固溶强化有关, 塑性、韧性的改善与组织的细化和超过临界尺寸的固溶体(Nb, Ti)ss颗粒增多等因素有关.
郭建亭,周兰章,田玉新,侯介山,李谷松 . 合金元素Hf, Sn, Ta, Zr, Dy和Ho对Nb-Nb5Si3合金组织和力学性能的影响*[J]. 金属学报, 2015 , 51(7) : 815 -827 . DOI: 10.11900/0412.1961.2014.00477
This paper reviews the research works of effects of elements on the microstructure and mechanical properties of Nb-Si alloys conducted by the authors in recent years, including effect of Hf on Ni-16Si, Hf and Sn on Ni-20Ti-5Cr-3Al-18Si, Zr on Ni-22Ti-16Si, Ta on Nb-22Ti-16Si-7Cr-3Al, and rare earth elements Dy and Ho on Ni-23Ti-10Ta-2Cr-18Si and Ni-22Ti-16Si-7Cr-3Al-3Ta-2Hf, respectively. The addition of elements Hf, Zr, Sn+Hf, Ta, Dy and Ho in Nb-Si binary system and multi-component system enhances room and high temperature strength, plasticity and fracture toughness obviously. The enhancement of strength is related with the solution strengthening of elements, and the improvement of plasticity and ductility is related with the fining of microstructure and the increase of particles which exceed the critical size of (Nb, Ti)ss.
Key words： Nb5Si3; alloy element; microstructure; mechanical property
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