摘要
:把温度T和应变速率ε·对Ti-47Al-2Mn-2Nb(TiAlMnNb)和Ti-47Al-2Mn-2Nb-0.8TiB2(TiAlMnNbB)合金在1073～1373K和10-5～10-1s-1条件范围内拉伸应力的影响归结为Zener-Hollomon因子Z=ε·exp(Q/RT)的影响,利用Sellars和Tegart提出的双曲函数,确定两种合金拉伸形变应力峰值σP与Z因子之间的关系函数;得到的σP解析表达式中A、α和n值分别为2.308×108s-1、8.50×10-9Pa-1和2.594(TiAlMnNb),1.423×1010s-1、6.275×10-9Pa-1和2.980(TiAlMnNbB);Z因子中的激活能Q值分别为322.3kJ/mol和351.6kJ/mol。
The effects of temperature and strain rate ε · on peak tensile flow stress σ P of Ti 47Al 2Mn 2Nb (TiAlMnNb) and Ti 47Al 2Mn 2Nb 0.8TiB 2 (TiAlMnNbB) alloys were reduced to that of Zener Hollomon factor Z = ε ·exp (Q/RT) at 1 073～1 373 K and strain rates 10 -5 ～10 -1 s -1 . The function correlating σ P and Z was fitted using the hyperbolic Arrhenius type equation put forward by Sellars and Tegart. A, α and n in the analytical expressions of σ P were fitted to be 2.308×10 8 s -1 , 8.50×10 -9 Pa -1 and 2.594 for TiAlMnNb alloy, and 1.423×10 10 s -1 , 6.275×10 -9 Pa -1 and 2.980 for TiAlMnNbB alloy, respectively. The values of activation energy Q in Z factor expression were regressed to be 322.3 and 351.6 kJ/mol for TiAlMnNb and TiAlMnNbB alloys, respectively, suggesting that the tensile plastic deformation at peak stress is controlled by an atomic diffusion process in nature.
出处
《上海交通大学学报》
CSCD
北大核心
2000年第3期338-341,346,共5页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金!资助项目(59331011)
