arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1508.04367cond-mat.mtrl-sci
收藏

温度梯度对扩散偶界面组织和扩散的影响:相场模拟

Effects of temperature gradient on the interface microstructure and diffusion of diffusion couples: phase-field simulation

Li Yong-Sheng, Wu Xing-Chao, Liu Wei, Hou Zhi-Yuan, Mei Hao-Jie

摘要:

采用相场模拟方法,研究了不同成分的亚稳合金在初始时效过程中产生的扩散偶,在温度梯度、浓度差和初始时效时间的相互作用下,扩散偶中的时间界面微观结构和扩散行为。成分的时间演变和分离相的体积分数指示了在温度梯度下元素通过界面的扩散方向。增大的温度梯度在界面两侧诱导出较宽的单相区。无论扩散方向是向上还是向下,都是通过界面向上扩散。对于初始时效时间较短的合金,伴随着互扩散的相变导致平直界面两侧为单相区。与温度梯度相比,扩散偶的成分差异和合金的初始时效时间对扩散和界面组织的影响更大。

英文摘要:

The temporal interface microstructure and diffusion in the diffusion couples with the mutual interactions of temperature gradient, concentration difference and initial aging time of the alloys were studied by phase-field simulation, the diffusion couples are produced by the initial aged spinodal alloys with different compositions. Temporal composition evolution and volume fraction of the separated phase indicates the element diffusion direction through the interface under the temperature gradient. The increased temperature gradient induces a wide single-phase region at two sides of the interface. The uphill diffusion proceeds through the interface, no matter the diffusion directions are up or down to the temperature gradient. For an alloy with short initial aging time, phase transformation accompanying the interdiffusion results in the straight interface with the single-phase regions at both sides. Comparing with the temperature gradient, composition difference of diffusion couple and initial aging time of the alloy show greater effect on the diffusion and interface microstructure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑