The mechanical behavior of coarse- and ultrafine-grained (CG/UFG) Zr–1Nb alloy specimens under quasi-static tensile testing, the distribution of ε_xx, ε_yy, ε_xy strains and the evolution of temperature patterns have been studied using the techniques of digital image correlation and infrared thermography. The microstructure of the Zr–1Nb alloy in the initial CG and UFG states, as well as after deformation at the prefracture stage, has been investigated. A study of the accumulation and dissipation of energy in these materials under tensile load has demonstrated the influence of the alloy heat capacity on these processes. It has been found that, under tensile testing, the Zr–1Nb alloy in the UFG state is characterized by a stage with constant temperature, which takes place up to ${\epsilon }_{true}\approx 0.04$ thus indicating that UFG materials, unlike CG ones, more efficiently use the structural energy absorption channel during deformation. The prefracture stage of the Zr–1Nb in the UFG state is characterized by the sharp temperature increase up to 60 °C. At this stage, the strain hardening coefficient becomes negative reaching values up to -6.5 GPa thus indicating local material softening before fracture. The formation of large local areas with disoriented mesh structure of dislocations is another feature of structural transformations in the Zr–1Nb alloy in the UFG state before fracture that also indicates a local material softening.

粗粒和超细颗粒（CG / UFG基）Zr-1NB合金试样的下准静态拉伸试验的机械性能，分布ε _XX，ε _yy的，ε _XY已经使用数字图像相关技术和红外热成像技术研究了应变和温度模式的演变。研究了Zr-1Nb合金在CG和UFG初始状态以及预断裂阶段变形后的显微组织。对这些材料在拉伸载荷下的能量积累和耗散的研究表明，合金热容对这些过程的影响。已经发现，在拉伸试验中，处于UFG状态的Zr–1Nb合金的特征在于具有恒定温度的阶段，该阶段的温度可达${\epsilon }_{Ť\mathrm{[R}üË}\approx 0.04$因此表明，与CG材料不同，UFG材料在变形过程中更有效地利用了结构能量吸收通道。UFG状态下Zr-1Nb的预破裂阶段的特征是温度急剧上升至60°C。在此阶段，应变硬化系数变为负值，达到-6.5 GPa，从而表明在断裂之前局部材料软化。Zr-1Nb合金在断裂前以UFG态存在的结构转变的另一个特征是，位错的错位网状结构形成了较大的局部区域，这也表明局部材料已软化。