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金. 在金. 在中显著的氧溶液增强效应的起源

Qian Yu¹, Liang Qi², Tomohito Tsuru³

¹Department of Materials Science and Engineering, University of California, Berkeley, CA, USA. National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.

Science (New York, N.Y.)

|February 7, 2015

概括

稀释氧溶液通过与螺杆位移芯相互作用,强烈强化 (Ti),挑战了关于金属溶液硬化功效的先前假设.

科学领域:

材料科学材料科学材料科学
金工业是一种金工业.
固态物理固态物理

背景情况:

结构合金通过溶解物原子得到增强,但这种效应在螺杆位移时是有限的.
溶液与脱位弹性场之间的弱相互作用阻碍了溶液的硬化.

研究的目的:

研究氧气在纯α- (α-Ti) 中强烈硬化作用背后的机制.
确定溶解物-脱位核心相互作用在增强材料中的作用.

主要方法:

传输电子显微镜 (TEM) 用于微观结构分析.
纳米机械测试用于描述材料属性.
原子级模拟的第一原则计算.

主要成果:

氧溶液在纯α-Ti中引起显著的硬化.
硬化源于氧气和螺杆脱位核心之间强烈的,短距离的排斥性相互作用.
螺杆位移主要在镜平面上滑动,从而促进这种相互作用.

结论:

间位溶液可以通过核心相互作用有效地加强材料,而不仅仅是弹性场相互作用.
这一发现为增强金属合金的机械性能提供了一个新的机制.
这项研究修订了对金属溶液硬化与移动螺丝失位的理解.

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