Effect of TiC on amorphous forming ability, microstructure, and thermal stability of Fe55Nb15Ti15Ta15 alloys
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摘要: 铁基非晶合金存在非晶形成能力低、室温塑性差等问题，极大地限制了其在工程中的应用。基于“近混合焓+有效原子尺寸差”非晶合金成分设计理念设计了Fe55Nb15Ti15Ta15全金属组元粉末，采用机械合金化球磨工艺成功制备出非晶态合金粉末，并研究了TiC陶瓷粉末的加入对Fe55Nb15Ti15Ta15合金粉末非晶形成能力、微观形貌和热稳定性的影响。结果表明：Fe55Nb15Ti15Ta15合金粉末具有较好的非晶形成能力和热稳定性，TiC陶瓷粉末均匀稳定的分布于Fe55Nb15Ti15Ta15非晶合金粉末中。添加质量分数15%TiC陶瓷粉末延缓了球磨过程中Fe55Nb15Ti15Ta15合金粉末的合金化和非晶化进程，降低了热稳定性，使得球磨后粉末粒度变小，分布范围变宽。该项工艺可制备出具有较大室温塑性的大块铁基非晶合金原始粉末。Abstract: Due to the low amorphous forming ability and the poor room temperature plasticity, the engineering applications of Fe-based amorphous alloys were greatly limited. Based on the design concept of “near mixing enthalpy with effective atomic size difference”, the Fe55Nb15Ti15Ta15 metal component powders were designed, and the amorphous alloy powders were successfully prepared by mechanical alloying. The effects of TiC ceramic powders doped during the mechanical alloying on the amorphous forming ability, microstructure, and thermal stability of the Fe55Nb15Ti15Ta15 alloy powders were studied. The results show that, the Fe55Nb15Ti15Ta15 alloy powders have the good amorphous forming ability and thermal stability, the TiC ceramic powders are uniformly and stably distributed in the Fe55Nb15Ti15Ta15 amorphous alloy powders. The addition of 15% TiC ceramic powders (mass fraction) delays the alloying and amorphization process of Fe55Nb15Ti15Ta15 alloy powders during ball milling, reduces the thermal stability, and makes the particle size of powders smaller and the distribution range wider after ball milling. This process can produce the large bulk Fe-based amorphous alloy powders with the high room temperature plasticity.
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Key words:
- amorphous alloys /
- mechanical alloying /
- forming ability /
- microstructure /
- thermal stability
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图 1 Fe−Nb−Ti−Ta合金系各组元混合焓关系图
Figure 1. Formation enthalpy relationship diagram for each component in the Fe−Nb−Ti−Ta alloy system
图 2 经不同时间球磨Fe55Nb15Ti15Ta15合金粉末的X射线衍射谱
Figure 2. XRD spectra of the Fe55Nb15Ti15Ta15 alloy powders with different ball milling times
图 3 经不同时间球磨Fe55Nb15Ti15Ta15+15%TiC合金粉末X射线衍射谱
Figure 3. XRD spectra of Fe55Nb15Ti15Ta15+15%TiC alloy powders with different ball milling times
图 4 经不同时间球磨Fe55Nb15Ti15Ta15合金粉末显微形貌和能谱分析：（a）5 h；（b）20 h；（c）40 h；（d）70 h；（e）80 h；（f）能谱分析
Figure 4. SEM images and EDS spectrum of the Fe55Nb15Ti15Ta15 alloy powders with different ball milling times: (a) 5 h; (b) 20 h; (c) 40 h; (d) 70 h; (e) 80 h; (f) EDS spectrum
图 5 经不同时间球磨Fe55Nb15Ti15Ta15+15%TiC合金粉末显微形貌和能谱分析：（a）5 h；（b）20 h；（c）40 h；（d）70 h；（e）80 h；（f）能谱分析
Figure 5. SEM images and EDS spectrum of the Fe55Nb15Ti15Ta15+15%TiC alloy powders with different ball milling times: (a) 5 h; (b) 20 h; (c) 40 h; (d) 70 h; (e) 80 h; (f) EDS spectrum
图 6 球磨80 h后Fe55Nb15Ti15Ta15合金粉末示差扫描量热曲线
Figure 6. DSC curves of the Fe55Nb15Ti15Ta15 alloy powders after ball milling for 80 h
图 7 球磨80 h后Fe55Nb15Ti15Ta15+15%TiC合金粉末示差扫描量热曲线
Figure 7. DSC curves of the Fe55Nb15Ti15Ta15+15%TiC alloy powders after ball milling for 80 h
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