Data for: Nanoindentation studies of the mechanical behaviours of spark plasma sintered multiwall carbon nanotubes reinforced Ti6Al4V nanocomposites

In this study, the influence of multiwall carbon nanotubes (MWCNT) additions on the mechanical properties of sintered Ti6Al4V-based nanocomposites was investigated. The nanocomposites were fabricated with varying weight fractions of MWCNT (0.5, 1.0 & 1.5 wt.%) using the spark plasma sintering (SPS) technique. Investigations were carried out using nanoindentation of varying indentation loads (50 mN, 75 mN and 100 mN) to assess the nanohardness (H) and reduced elastic modulus (Er) of the alloy and nanocomposites. Further analysis was done to evaluate the elastic recovery index (W_e⁄W_t ), plasticity index (W_p⁄W_t ), elastic strain resistance (H⁄E_r ) and yield pressure (H^3⁄(E_r^2 )) at the maximum load. Microstructural analysis revealed the presence of the MWCNT dispersed across the alpha and beta phases of the Ti6Al4V matrix. The nanoindentation studies showed that the nanohardness, elastic modulus, elastic recovery index, elastic strain resistance and anti-wear properties improved with the MWCNT addition and continually increased with increase in nanotubes content. Also, it was observed that the nanohardness and reduced elastic modulus of the fabricated nanocomposites are in the range of 4677-9276 MPa and 29.3-60.9 GPa respectively which declined with increase in indentation load. The sintered Ti6Al4V displayed the least resistance to plastic deformation.本研究探讨了多壁碳纳米管（multiwall carbon nanotubes, MWCNT）添加量对烧结Ti6Al4V基纳米复合材料力学性能的影响。实验采用放电等离子烧结（spark plasma sintering, SPS）技术，制备了MWCNT质量分数分别为0.5%、1.0%及1.5%的纳米复合材料。通过施加50 mN、75 mN与100 mN三种不同压痕载荷的纳米压痕（nanoindentation）测试，表征了合金及纳米复合材料的纳米硬度（H）与弹性模量（Er）。进一步分析了最大载荷下的弹性回复率（W_e/W_t）、塑性指数（W_p/W_t）、弹性应变抗力（H/E_r）与屈服压力（H³/E_r²）。显微结构分析表明，MWCNT均匀分散于Ti6Al4V基体的α相与β相之中。纳米压痕测试结果显示，随着MWCNT添加量提升，纳米硬度、弹性模量、弹性回复率、弹性应变抗力及耐磨性能均得到改善并随MWCNT含量增加持续提升。同时观测发现，所制备纳米复合材料的纳米硬度与弹性模量分别处于4677~9276 MPa与29.3~60.9 GPa区间，且二者随压痕载荷增大而降低。烧结Ti6Al4V本身的抗塑性变形能力最弱。