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相关概念视频

Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.

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相关实验视频

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Negative Additive Manufacturing of Complex Shaped Boron Carbides
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走向廉价的超硬材料:基于四玻化的固体溶液.

Reza Mohammadi1, Miao Xie, Andrew T Lech

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California, USA.

Journal of the American Chemical Society
|November 23, 2012
PubMed
概括
此摘要是机器生成的。

研究人员通过创建用,和的固体溶液来增强四氧化 (WB(4) 的硬度. 最硬的材料达到了57.3GPa的维克尔硬度,显示了先进材料应用的潜力.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学

背景情况:

  • 四化 (WB(4)) 是晚期过渡金属化物中的一个具有成本效益的材料.
  • 提高其硬度对于扩大其应用至关重要.

研究的目的:

  • 为了合成和描述WB(4) (Ta), (Mn) 和 (Cr) 的固体溶液.
  • 调查这些添加物对WB的硬度和结构性质的影响.

主要方法:

  • 固体溶液通过弧形融合成.
  • 使用能量分散式X射线光谱 (EDS) 和X射线衍射 (XRD) 分析了元素和相位纯度.
  • 维克斯硬度是通过微内置测量,并使用高压XRD来确定散装模量.

主要成果:

  • 在WB中确定了可溶性极限:Cr为<10at.%,Mn为<20at.%,Ta为>20at.%.
  • 优化的硬度值达到57.3±1.9 GPa的W{0.93) Ta{0.02) Cr{0.05) B{4) 在0.49N负载下.
  • 最硬的固体溶液体积模量为335±3 GPa,并抑制了压力诱导的相变.

结论:

  • 带有Ta和Cr的WB(4) 的三级固体溶液显著提高了硬度.
  • 开发的W-Ta-Cr-B(4) 材料显示出优越的机械性能和压力下相位稳定性.