This article presents the results of modeling the mechanical behavior of Zr–Nb and Ti–Nb alloys in a range of strain rates from 0.001 to 1000 1/s and temperature range 297–1273 K. A modification of constitutive equations describing the mechanical response of fine-grained and coarse-grained Zr–1Nb and Ti–13Nb–13Zr alloys in a wide temperature range is proposed. It was shown that the phase transition between the hexagonal closed packed and body-centered cubic crystal structure at elevated temperatures leads to a sharp change in strain rate sensitivity of the yield strength of Zr–Nb and Ti–Nb alloys. The proposed modifications of constitutive equations make it possible to describe the strain hardening and the strain rate sensitivity of the plastic flow stress over a wide temperature range in the coarse-crystalline and ultrafine-grained Zr–Nb and Ti–Nb alloys. The results can be used for engineering analysis of structural elements of technical systems and design of manufacturing technologies for biomedical products.

本文介绍了Zr–Nb和Ti–Nb合金在0.001至1000 1 / s的应变速率和297–1273 K的温度范围内的力学行为的建模结果。描述了本构方程的力学响应的修正提出了在宽温度范围内的细晶粒和粗晶粒Zr-1Nb和Ti-13Nb-13Zr合金。结果表明，在高温下六角形密堆积和体心立方晶体结构之间的相变导致Zr-Nb和Ti-Nb合金的屈服强度的应变速率敏感性急剧变化。对本构方程的拟议修改使描述粗晶和超细晶粒Zr-Nb和Ti-Nb合金在较宽温度范围内塑性流动应力的应变硬化和应变速率敏感性成为可能。该结果可用于技术系统的结构要素的工程分析和生物医学产品的制造技术设计。