Low ductility and toughness of molybdenum (Mo) alloys have usually been the bottleneck for their further application. Here, the improved strength together with ultra-high ductility and fracture toughness of Mo alloys were achieved by the incorporation of Mo₂TiC₂ (a typical MXene). Elongation of Mo–Mo₂TiC₂ alloys increased to 2.3–2.7 folds of pure Mo and the fracture toughness increased to 2.4 folds when Mo₂TiC₂ content rose to 2 wt%. Also, yield strength and tensile strength of Mo–Mo₂TiC₂ alloys increased slightly compared with pure Mo. The relationship between microstructural features and deformation behavior in Mo–Mo₂TiC₂ alloys was discussed to account for the toughening mechanisms, among which the high relative density, grain refinement, high low-angle grain boundaries (LGBs) proportion and strain hardening rate were the main reasons for the superior ductility (elongation, 39.4%–46.5%) in Mo–Mo₂TiC₂ alloys. Besides, the ultra-high toughness of Mo–Mo₂TiC₂ alloys was originated from not only the plastic deformation capacity, but also the crack deflection, particles pull-out and secondary cracking.

钼（Mo）合金的低延展性和韧性通常是其进一步应用的瓶颈。在此，通过引入Mo ₂ TiC ₂（典型的MXene），实现了Mo合金的提高的强度以及超高的延展性和断裂韧性。当Mo ₂ TiC ₂含量增加到2 wt％时，Mo–Mo ₂ TiC ₂合金的伸长率增加到纯Mo的2.3–2.7倍，断裂韧性增加到2.4倍。此外，Mo-Mo ₂ TiC ₂合金的屈服强度和拉伸强度比纯Mo略有增加。Mo-Mo的微观结构特征与变形行为之间的关系讨论了₂ TiC ₂合金的增韧机理，其中高相对密度，晶粒细化，高低角晶界（LGBs）比例和应变硬化率是产生优异延展性的主要原因（伸长率为39.4％ ––46.5％）在Mo–Mo ₂ TiC ₂合金中。此外，Mo-Mo ₂ TiC ₂合金的超高韧性不仅来自塑性变形能力，还归因于裂纹变形，颗粒脱落和二次裂纹。