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超細(xì)晶工業(yè)純鈦的變形、應(yīng)變速率敏感性和激活體積
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作者單位:

1.西安建筑科技大學(xué)冶金工程學(xué)院;2.遼寧科技大學(xué)材料與冶金學(xué)院

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基金項(xiàng)目:

國家自然科學(xué)基金項(xiàng)目面上項(xiàng)目(51474170)，陜西省自然科學(xué)基金青年項(xiàng)目(2016JQ5026)，遼寧省教育廳專項(xiàng)基金(2017LNQN14)


Deformation, strain rate sensitivity and activation volume of ultrafine-grained commercially pure Ti
Author:
Affiliation:

School of Metallurgical Engineering, Xi’an University of Architecture and Technology

Fund Project:

Nature Science Foundation of China(51474170), Nature Science Foundation of Shaanxi Province(2016JQ5026), Research Fund of Educational Commission of Liaoning Province(2017LNQN14)

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    摘要:

    在溫度為250~450 ℃、應(yīng)變速率為1×10-4-1 s-1的條件下，對超細(xì)晶工業(yè)純鈦進(jìn)行變速率壓縮實(shí)驗(yàn)，計(jì)算超細(xì)晶工業(yè)純鈦的應(yīng)變速率敏感性因子和激活體積，并研究超細(xì)晶工業(yè)純鈦的變形行為。研究結(jié)果表明：超細(xì)晶工業(yè)純鈦在穩(wěn)態(tài)變形階段存在流變軟化效應(yīng)，這是受變形過程中大角度晶界和位錯活動所控制的。超細(xì)晶工業(yè)純鈦的應(yīng)變速率敏感性因子和激活體積在數(shù)值上都相對較低，應(yīng)變速率敏感性隨著變形溫度的升高而增加，但激活體積獨(dú)立于變形溫度。應(yīng)變速率敏感性和激活體積的數(shù)值表明晶粒內(nèi)部位錯之間的交互作用幾乎不發(fā)生，而位錯與晶界之間的交互作用顯著影響超細(xì)晶工業(yè)純鈦的塑性變形。

    Abstract:

    The deformation behavior of ultrafine-grained (UFG) commercially pure (CP) Ti was investigated. The strain rate sensitivity and activation volume were calculated from strain rate jump tests performed at a temperature range of 250-450 °C and strain rate of 1×10-4 - 1 s-1. The results show that flow softening effect in steady state of deformation occurs in UFG CP Ti which is controlled by high-angle grain boundaries and dislocation activity during the deformation process. Strain rate sensitivity of UFG CP Ti is relatively low in value and increases with the rise of temperature. The activation volume of UFG CP Ti is also low in value and invariant with temperature. The values of strain rate sensitivity and activation volume indicate that dislocation-dislocation interactions within the grain interiors take place scarcely and interactions between dislocation and grain boundary can significantly affect plastic deformation of UFG CP Ti.

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引用本文

劉曉燕,張琪,楊西榮,亢淑梅.超細(xì)晶工業(yè)純鈦的變形、應(yīng)變速率敏感性和激活體積[J].稀有金屬材料與工程,2020,49(6):1867~1872.[LIU Xiaoyan, ZHANG Qi, YANG Xirong, KANG Shumei. Deformation, strain rate sensitivity and activation volume of ultrafine-grained commercially pure Ti[J]. Rare Metal Materials and Engineering,2020,49(6):1867~1872.]
DOI：10.12442/j. issn.1002-185X.20190104

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  • 收稿日期:2019-01-26
  • 最后修改日期:2019-04-10
  • 錄用日期:2019-05-14
  • 在線發(fā)布日期: 2020-07-09
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