Abstract In this paper, the effect of severe plastic deformation (SPD) induced by high-pressure torsion (HPT) and isothermal heat treatment (HT) below the glass transition on the structure-property relationships of Cu46Zr46Al8 bulk metallic glass (BMG) is assessed separately and alternately in reference to the as-cast state. Pronounced modifications are confirmed by X-ray diffraction, differential scanning calorimetry, dynamic mechanical analysis (DMA), dilatometry analysis, and scanning electron microscopy. Diffusion-controlled crystallization is achieved via HT with optimized parameters, and HPT is used afterwards to disperse crystalline phases relatively homogenous throughout the matrix. The dispersion of the second phase improves the thermomechanical stability around the glass transition temperature, as confirmed by DMA. Compared to a single HT process, a sequential combination of HT + HPT leads to a glass showing a linear hardness profile with values higher than the as-cast state. This study provides insights into possible processing routes for enhancing the mechanical and/or thermal properties of CuZr-based BMGs, which can also be used to tailor new design routes for other BMG systems.

中文翻译：

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组合退火和塑性变形处理对Cu46Zr46Al8块状金属玻璃本征性能的影响

摘要 本文评估了高压扭转 (HPT) 和玻璃化转变以下等温热处理 (HT) 引起的严重塑性变形 (SPD) 对 Cu46Zr46Al8 块状金属玻璃 (BMG) 结构-性能关系的影响。分别和交替地参考铸态。X 射线衍射、差示扫描量热法、动态力学分析 (DMA)、膨胀分析和扫描电子显微镜证实了明显的修改。扩散控制结晶是通过优化参数的 HT 实现的，然后使用 HPT 将相对均匀的结晶相分散在整个基质中。DMA 证实，第二相的分散提高了玻璃化转变温度附近的热机械稳定性。与单一 HT 工艺相比，HT + HPT 的顺序组合导致玻璃显示出线性硬度分布，其值高于铸态。这项研究提供了对增强 CuZr 基 BMG 的机械和/或热性能的可能加工路线的见解，这也可用于为其他 BMG 系统定制新的设计路线。