Work-hardening and twinning behaviors in a commercially pure titanium sheet under various loading paths
Work-hardening and twinning behaviors in a commercially pure titanium sheet under various loading paths
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DOI：
10.1016/j.msea.2014.10.024
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发表时间：
2015-01-03
期刊：
影响因子：
6.4
通讯作者：
Takuda, Hirohiko
中科院分区：
文献类型：
--
作者：
Hama, Takayuki;Nagao, Hirotaka;Takuda, Hirohiko
研究了工业纯钛板在不同加载路径下的加工硬化和孪晶行为。拉伸和压缩的屈服应力相同，而压缩时的加工硬化略大于拉伸时的加工硬化。这些趋势在滚动方向和横向方向上都是相同的。当薄板受到反向加载时，在拉-压和压-拉过程中都观察到包辛格效应。包辛格效应的趋势几乎与本研究中测试的应变路径无关。在拉伸过程中，观察了（10 (1)over bar2）拉伸孪晶、（11 (2)over bar2）压缩孪晶和(11 (2)over bar1}拉伸孪晶的活性。或者，在压缩过程中，观察到（10 (1)/ bar2）拉伸孪晶的活性，并且比拉伸时的活性大得多。当板材在压缩后受到张力时，就会发生脱孪生。虽然孪晶活动的趋势与镁合金板相似，但在应力-应变曲线上观察到的行为与镁合金板有很大不同。在此基础上，讨论了孪晶和去孪晶活动对加工硬化行为的影响。(C) 2014 Elsevier B.V.版权所有
In this study, the work-hardening and twinning behaviors in a commercially pure titanium sheet were examined under various loading paths including reverse loading. The yield stress was identical between tension and compression, while the work-hardening was slightly larger during compression than during tension. These tendencies were the same in both the rolling and transverse directions. When the sheet was subjected to reverse loading, the Bauschinger effect was observed during both tension-compression and compression-tension. The tendency in the Bauschinger effect was nearly independent of the strain path tested in the present study. Concerning the twinning, the activities of (10 (1) over bar2) tensile twinning, (11 (2) over bar2) compressive twinning, and {11 (2) over bar1} tensile twinning were observed during tension. Alternatively, during compression, the activity of (10 (1) over bar2) tensile twinning was observed and was much larger than that during tension. When the sheet was subjected to tension following compression, detwinning occurred. Although the trend in the activity of twinning was similar to that of a magnesium alloy sheet, the behavior observed in the stress-strain curves was quite different from that of a magnesium alloy sheet. Based on the results presented, the effect of twinning and detwinning activities on the work-hardening behavior was discussed. (C) 2014 Elsevier B.V. All rights reserved.