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GH690合金拉伸變形行為的溫度敏感性
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國家“973”課題（2006CB605005）；長江學者創(chuàng)新團隊課題（IRT0713）


Temperature Sensitivity of the Tensile Deformation Behavior for GH690 Alloy
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    摘要:

    通過拉伸試驗研究了GH690合金從298~623 K的變形行為，用光學顯微鏡、掃描電鏡和透射電鏡觀察了變形組織。結果表明，合金在298 K拉伸時能夠通過孿生協(xié)調變形，生成的形變孿晶阻礙了位錯的滑移，從而使合金獲得了較高的加工硬化速率，導致合金的強度和塑性較高。隨著形變溫度的升高，合金通過孿生協(xié)調變形的能力降低，變形機制由孿生轉變?yōu)榛?，滑移產(chǎn)生的加工硬化效應小于孿生, 因此合金的強度和塑性隨之降低。

    Abstract:

    The deformation behavior of GH690 alloy from 298 K to 623 K was investigated by tensile tests. The deformation microstructure was observed by OM, SEM, and TEM. The results show that the twinning is the main deformation mechanism for GH690 alloy at 298 K. Under this condition, both high tensile strength and elongation can be obtained because the deformation twins formed in plastic deformation can act as obstacles to dislocations, resulting in obvious work hardening effect. However, as the number of the deformation twins decreases with increasing of the testing temperature, the deformation mechanism of the alloy translates from twinning to dislocation slipping. As the work hardening effect of dislocation slip mechanism is less than that of twinning mechanism, the tensile strength and plasticity of the alloy are decreased with increasing of the testing temperature.

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王富強,王 磊,劉 楊,王 朋,封 輝. GH690合金拉伸變形行為的溫度敏感性[J].稀有金屬材料與工程,2012,41(3):432~436.[Wang Fuqiang, Wang Lei, Liu Yang, Wang Peng, Feng Hui. Temperature Sensitivity of the Tensile Deformation Behavior for GH690 Alloy[J]. Rare Metal Materials and Engineering,2012,41(3):432~436.]
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  • 收稿日期:2011-03-31
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