Ti2448合金在不同應(yīng)變速率下的高溫變形機(jī)制
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時(shí)間：2016-01-04
通過(guò)對(duì)亞穩(wěn)β-Ti2448合金進(jìn)行Gleeble熱模擬壓縮實(shí)驗(yàn)，研究其在單相β區(qū)的高溫變形機(jī)制。
Ti2448合金在不同應(yīng)變速率下的高溫變形機(jī)制Elevated temperature deformation mechanism of Ti2448 alloy at different strain rates?通過(guò)對(duì)亞穩(wěn)β-Ti2448合金進(jìn)行Gleeble熱模擬壓縮實(shí)驗(yàn)，研究其在單相β區(qū)的高溫變形機(jī)制。結(jié)果表明：Ti2448合金的高溫變形機(jī)制與應(yīng)變速率有關(guān)，在較低應(yīng)變速率(10?3~10?1?s?1)范圍內(nèi)，合金表現(xiàn)出初始應(yīng)力峰值，隨后逐漸軟化直到達(dá)到穩(wěn)態(tài)流變；其變形機(jī)制主要是形核和新晶粒長(zhǎng)大的不連續(xù)動(dòng)態(tài)再結(jié)晶(DDRX)。在較高的應(yīng)變速率(1~63 s?1)范圍內(nèi)，合金首先表現(xiàn)出明顯的硬化，隨后略有軟化，最后達(dá)到穩(wěn)態(tài)；其變形機(jī)制主要是位錯(cuò)滑移主導(dǎo)的塑性變形，位錯(cuò)與晶界以及亞晶界之間的相互作用促使小角度晶界向高角度晶界的轉(zhuǎn)變，表明變形機(jī)制為連續(xù)動(dòng)態(tài)再結(jié)晶(CDRX)。
The deformation mechanism of metastable β-Ti2448 alloy at elevated temperature was investigated by compression tests using Gleeble 3800 isothermal thermal simulator. The result shows that the deformation mechanism of Ti2448 at elevated temperature is associated with strain rate. In the lower strain rate range (10?3?10?1s?1), the alloy exhibits stress peak in the initial stage and gradually softens subsequently until steady-flow. The primary mechanism of Ti2448 alloy at lower strain rate is discontinuous dynamic recrystallization (DDRX), with the characteristic of nucleation and new grain growth. In the higher strain rate range of 1~63 s?1, the alloy presents obvious hardening firstly, then slight softening and steady-state finally. The leading mechanism of Ti2448 alloy at higher strain rate is plastic deformation dominated by dislocation slipping. The interaction between dislocations and grain or sub-grain boundaries induces the transformation of low angle boundaries into high angle boundaries, which indicates continuous dynamic recrystallization (CDRX).
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