Nanoindentation Measurement of Creep Stress Exponent of Ti6A14V Alloy at Room Temperature

作者：Meng Longhui; Yang Yinfei^*; He Ning

来源：Rare Metal Materials and Engineering, 2016, 45(3): 617-622.

• nanoindentation
• Ti6Al4V
• room temperature
• creep
• stress exponent

This paper presents a method for measuring the creep stress exponent of Ti6Al4V alloy at room temperature based on the dwelling period of constant loading rate nanoindentation. As to find out the effect of the loading rate and the maximum load on the experiment result, the diamond Berkovich indenter was loaded to different maximum loads with different loading rates, then the maximum load was held as a constant for 5 min, and the stress exponent of the material at room temperature was discovered based on the relationship between the indentation strain rate and the hardness during the holding period. Results show that the effects of the loading rate and the maximum load are too small to affect the result so that they can be ignored, and the creep stress exponent of Ti6Al4V at room temperature got from the experiment is between 7.0513 similar to 7.216.

• 出版日期2016-3
• 单位南京航空航天大学