摘要
为了揭示微量B对NiAl的显微组织和性能的影响,利用非自耗电弧炉熔炼了四种不同B含量(0.005,0.02,0.05,0.15,质量分数,%)的NiAl-B合金。NiAl-B合金的铸态组织均由单相NiAl组成,且随着B含量的增加,晶粒横向尺寸由约200μm减小到约50μm。B改善了NiAl合金的室温压缩塑性,四种合金的室温压缩塑性均达到6%左右。合金的硬度和压缩屈服强度随着B含量的增加而升高,其中,压缩屈服强度由纯二元NiAl的249MPa升高到B含量为0.15%时的491MPa。合金强度和硬度的升高起因于B的固溶强化和晶粒细化。
To investigate the effect of a small amount of element B on the microstructures and properties of NiAl alloys, NiAl-B alloys with four different B content （0.005, 0.02, 0.05, 0.15, wt. %） are melted by the non-consumable electric-arc furnace. The results show that the microstructures of as-cast NiAl-B alloys are composed of single NiA1 phases. The transverse grain sizes reduce from approximately 200μm to 50μm with the increase of B content. The compressive strain of NiAl-B alloys at room temperature is improved by adding B element. The compressive strain for all NiAl-B alloys at room temperature reaches approximately 6%. Also, the hardness and the compressive yield strength of NiAl-B alloys increase with the increase of B content. In particular, the compressive yield strengths increase from 249 MPa （NiAl） to 491 MPa （NiAl-0.15%B）. The enhancement of the strength and hardness of NiAl-B alloys are resulted from the solid solution strengthening and the grain refinement produced by adding element B.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2009年第3期464-466,共3页
Journal of Liaoning Technical University (Natural Science)
基金
辽宁省自然科学基金资助项目(20021071)
辽宁省教育厅科学研究资助项目(2004C002)
关键词
NIAL
B微合金化
固溶强化
NiAl
Micro-alloying of B
Solution strengthening
