TC11钛合金应变率相关的拉伸行为

Strain Rate Dependent Tension Behavior of TC11 Titanium Alloys

摘要:

为了获取TC11钛合金拉伸性能随应变率的变化规律，对该材料开展了宽应变率范围下的单轴拉伸试验。结果表明，随着应变率从准静态增加到动态，TC11钛合金的屈服强度略有上升，而应变硬化模量下降。此外，在准静态和动态拉伸下，TC11钛合金均发生了剪切断裂，但动态断裂面上韧窝尺寸小于准静态断面上韧窝尺寸。进一步对材料在变形过程中的温升进行了分析，结果发现，高应变率下材料断裂面上更小尺寸的韧窝和材料更容易发生应变软化归因于动态加载情况下材料中产生了更高的温升。

Abstract:

In order to investigate the effect of strain rate on the tension behavior of TC11 titanium alloy, uniaxial tensile tests were conducted on this material over a wide range of strain rate. The results demonstrate that as the strain rate increases from quasistatic to dynamic, the yield strength of the TC11 titanium alloy increases slightly. The reduction of the strain hardening modulus is found under dynamic tension. Furthermore, the TC11 titanium alloy fails in shear under both the quasistatic and dynamic tension. However, the dimple size under dynamic fracture is smaller than that under quasistatic loading. By analyzing the temperature rise in the material during deformation, it is found that the easier strain softening and the smaller dimple size on the fracture surface at high strain rate may be attributed to the higher temperature rise.