Babalola Bukola Joseph, Ayodele Olusoji Oluremi, Olubambi Peter Apata
Centre for Nanoengineering and Advanced Materials, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Johannesburg 2028, South Africa.
Materials (Basel). 2023 Mar 24;16(7):2607. doi: 10.3390/ma16072607.
The nanohardness, elastic modulus, anti-wear, and deformability characteristics of TiAl-TaN composites containing 0, 2, 4, 6, 8, and 10 wt.% of TaN were investigated via nanoindentation technique in the present study. The TiAl-TaN composites were successfully fabricated via the spark plasma sintering technique (SPS). The microstructure and phase formation of the TiAl sample constitute a duplex structure of γ and lamellar colonies, and TiAl, α-Ti, and TiAl phases, respectively. The addition of TaN results in a complex phase formation and pseudo duplex structure. The depth-sensing indentation evaluation of properties was carried out at an ambient temperature through a Berkovich indenter at a prescribed load of 100 mN and a holding time of 10 s. The nanoindentation result showed that the nanohardness and elastic modulus characteristics increased as the TaN addition increased but exhibited a slight drop when the reinforcement was beyond 8 wt.%. At increasing TaN addition, the yield strain (HEr), yield pressure (H3Er2), and elastic recovery index (WeWt) increased, while the plasticity index (WpWt) and the ratio of plastic and elastic work (RPE) reduced. The best mechanical properties were attained at the 8 wt.%TaN addition.
在本研究中，通过纳米压痕技术研究了含有0、2、4、6、8和10 wt.% TaN的TiAl-TaN复合材料的纳米硬度、弹性模量、抗磨损和可变形性特征。TiAl-TaN复合材料通过放电等离子烧结技术（SPS）成功制备。TiAl样品的微观结构和相组成分别构成γ和片状晶团的双相结构，以及TiAl、α-Ti和TiAl相。TaN的添加导致复杂的相形成和伪双相结构。在室温下，通过Berkovich压头在规定载荷100 mN和保持时间10 s下进行性能的深度传感压痕评估。纳米压痕结果表明，随着TaN添加量的增加，纳米硬度和弹性模量特征增加，但当增强相超过8 wt.%时略有下降。随着TaN添加量的增加，屈服应变（HEr）、屈服压力（H3Er2）和弹性恢复指数（WeWt）增加，而塑性指数（WpWt）和塑性与弹性功之比（RPE）降低。在添加8 wt.% TaN时获得了最佳力学性能。
