發(fā)布時(shí)間：2018-09-01 10:26

【摘要】：利用動(dòng)態(tài)塑性變形(DPD)和準(zhǔn)靜態(tài)壓縮變形(QSC)技術(shù)對(duì)純鈦圓柱樣品進(jìn)行對(duì)比壓縮試驗(yàn),研究了不同應(yīng)變速率下純鈦形變孿晶和微結(jié)構(gòu)演變。結(jié)果發(fā)現(xiàn):2種變形方式的變形機(jī)制相似,低應(yīng)變時(shí)以形變孿生為主,孿生飽和后轉(zhuǎn)變?yōu)槲诲e(cuò)滑移主導(dǎo);高應(yīng)變速率促進(jìn)了形變孿晶的產(chǎn)生,激發(fā){4211}壓縮孿晶的形成,同時(shí)使變形機(jī)制轉(zhuǎn)變臨界應(yīng)變提前至0.2;純鈦在高應(yīng)變速率和高應(yīng)變(ε≥0.6)下出現(xiàn)絕熱剪切帶(ASB)。
[Abstract]:Dynamic plastic deformation (DPD) and quasi-static compression deformation (QSC) techniques were used to study the deformation twin and microstructure evolution of pure titanium at different strain rates. The results show that the deformation mechanism of the two deformation modes is similar, the twinning is dominated by deformation twinning at low strain, and the twinning changes to dislocation slip after saturation, and high strain rate promotes the formation of deformation twins and excites the formation of {4211} compression twins. At the same time, the critical strain of deformation mechanism transition was advanced to 0.2, and the adiabatic shear band (ASB). Appeared in pure titanium at high strain rate and high strain (蔚 鈮，

本文編號(hào)：2216911