Thermal expansion accompanying the glass-liquid transition and crystallization
Thermal expansion accompanying the glass-liquid transition and crystallization
复制标题
伴随玻璃液转变和结晶的热膨胀
DOI：
10.1063/1.4939216
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发表时间：
2015
期刊：
影响因子：
1.6
通讯作者：
Wilde G.
中科院分区：
文献类型：
--
作者：
Jiang M. Q.;Naderi M.;Wang Y. J.;Peterlechner M.;Liu X. F.;Zeng F.;Jiang F.;Dai L. H.;Wilde G.
本文报道了zr基（Vitreloy 1）大块金属玻璃在铸态、退火态和结晶态下的线性热膨胀行为。随着玻璃-液相转变，铸态玻璃1的热膨胀率连续下降，而退火玻璃的热膨胀率突然上升。结晶后的玻璃钢1在熔化前表现出几乎不变的热膨胀率。此外，还证明了晶相的成核可以引起过冷液体的显著热收缩，但随着这些晶相的长大，热膨胀再次占主导地位。这些结果是在势能景观的框架下解释的，主张结构和振动对玻璃热膨胀的贡献取决于结构和温度。
We report the linear thermal expansion behaviors of a Zr-based (Vitreloy 1) bulk metallic glass in its as-cast, annealed and crystallized states. Accompanying the glass-liquid transition, the as-cast Vitreloy 1 shows a continuous decrease in the thermal expansivity, whereas the annealed glass shows a sudden increase. The crystallized Vitreloy 1 exhibits an almost unchanged thermal expansivity prior to its melting. Furthermore, it is demonstrated that the nucleation of crystalline phases can induce a significant thermal shrinkage of the supercooled liquid, but with the growth of these nuclei, the thermal expansion again dominates. These results are explained in the framework of the potential energy landscape, advocating that the configurational and vibrational contributions to the thermal expansion of the glass depend on both, structure and temperature.