白亚平,罗佳佳,李建平,杨忠,郭永春.纳米NiAl相对铁基合金显微组织、力学及氧化性能的影响[J].表面技术,2019,48(8):144-150.
BAI Ya-ping,LUO Jia-jia,LI Jian-ping,YANG Zhong,GUO Yong-chun.Effect of Nano-NiAl Phase on Microstructure and Mechanical and Oxidation Properties of Fe-based Alloys[J].Surface Technology,2019,48(8):144-150 |
| 纳米NiAl相对铁基合金显微组织、力学及氧化性能的影响 |
| Effect of Nano-NiAl Phase on Microstructure and Mechanical and Oxidation Properties of Fe-based Alloys |
| 投稿时间：2018-11-03 修订日期：2019-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.019 |
| 中文关键词: NiAl/Fe合金 纳米NiAl相 显微组织 力学性能 氧化性能 |
| 英文关键词:NiAl/Fe alloy Nano-NiAl phase microstructure mechanical properties oxidation properties |
| 基金项目:国家自然科学基金（51705391）；陕西省教育厅专项科学研究计划（17JK0383）；装备预研领域基金重点项目（6140922010301）；陕西省创新人才推进计划-科技创新团队（2017KCT-05） |
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| Author | Institution |
| BAI Ya-ping | School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China |
| LUO Jia-jia | School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China |
| LI Jian-ping | School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China |
| YANG Zhong | School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China |
| GUO Yong-chun | School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China |
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| 中文摘要: |
| 目的 通过机械合金化与热压烧结相结合的方法制备含有B2结构纳米NiAl相的铁基合金，研究不同含量（质量分数为30%、40%、50%、60%）的纳米NiAl相，对合金显微组织及力学性能的影响。方法 以Ni粉和Al粉为原材料，通过高能球磨法制备B2结构纳米NiAl粉体，采用真空热压烧结炉将NiAl粉体与Fe粉混合烧结，得到块体试样。采用扫描电镜（Scanning electron microscopy, SEM）进行微观组织观察，采用能谱仪（Energy dispersive spectroscopy, EDS）、X射线衍射仪（X-ray diffraction, XRD）以及透射电子显微镜（Transmission electron microscopy, TEM）进行物相分析，并测试不同NiAl含量的铁基合金的硬度、密度、室温压缩性能以及600 ℃的抗氧化性能。结果 合金的硬度、抗压强度随NiAl含量先增后降。当NiAl的质量分数为50%时，合金硬度为35.2HRC，抗压强度为2530 MPa，密度为6.68 g/cm3，较未添加NiAl时，合金的抗压强度提升了239.6%，密度降低了14.5%。θ=600 ℃、t=1200 min时，其表面氧化增重较纯铁降低了37.9%，此时NiAl相的尺寸约为100~200 nm，组织最为均匀，致密度较高。结论 纳米NiAl相在降低铁基合金密度的同时，能有效提升其力学性能与抗氧化性能，但由于B2结构的纳米NiAl相为一种硬脆相，当其含量过高时，会极大程度地降低合金的力学性能。 |
| 英文摘要: |
| The work aims to prepare the Fe-based alloy containing nano-NiAl phase with B2 structure by mechanical alloying and hot-press sintering and then study the effects of different nano-NiAl contents (30%, 40%, 50%, and 60%) on the microstructure and mechanical property of alloy. Ni powder and Al powder were used as raw materials to prepare B2 nano-NiAl powder by high-energy ball milling. The NiAl powder and Fe powder were mixed and sintered by vacuum hot-pressing sintering furnace to obtain the block sample. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to observe microstructure and analyze phases. Hardness, density, compressive strength and oxidation resistance (600 ℃) of Fe-based alloys with different contents of NiAl were tested. Hardness and compressive strength of alloy increased firstly, and then decreased with NiAl content. When NiAl content was 50wt.%, hardness and compressive strength of alloy were 35.2 HRC and 2,530 MPa respectively and the density was 6.68 g/cm3. The compressive strength of the alloy increased by 239.6% and the density decreased by 14.5% when compared with those of alloy not added with NiAl. When θ=600 ℃ and t=1200 min, the surface oxidation weight gain was reduced by 37.9% compared with that of pure iron. NiAl phase size was about 100~200 nm and the phase had the most uniform structure and the highest density. Nano-NiAl with B2 structure can effectively reduce the density of iron-based alloy and improve the mechanical properties. However, the mechanical properties of the alloy are greatly reduced, when NiAl content is too high, since nano-NiAl phase with B2 structure is a hard and brittle phase. |
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