Cu44.25Ag14.75Zr36Ti5 和 Ti32.8Zr30.2Cu9Ni5.3Be22.7 脆性 BMG 在过冷液体区的流变行为

IF 3.2 3区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of Non-crystalline Solids Pub Date : 2024-09-07 DOI:10.1016/j.jnoncrysol.2024.123210
Rujie Wang , Huaxin Yao , Engang Wang , Yong Shen , Peng Jia
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引用次数: 0

摘要

块状金属玻璃(BMG)在室温下的塑性有限。然而,BMG 通常在过冷液体区(SLR)表现出超塑性和高塑性成型能力。BMG 在过冷液体区的流变行为对其热塑性成型过程至关重要。与韧性 BMGs 不同,脆性 BMGs 的热塑性变形行为鲜有报道。本研究在 Gleeble3500 上研究了两种具有高玻璃成形能力的脆性 BMG:Cu44.25Ag14.75Zr36Ti5 和 Ti32.8Zr30.2Cu9Ni5.3Be22.7。根据温度和应变速率的不同,这两种 BMG 可发生均匀变形。m 值(应变速率敏感性指数)是超塑性材料最重要的力学特征,根据这一高值,两种 BMG 在其 SLR 中表现出超塑性,m 值≥ 0.3。根据自由体积模型计算,Cu44.25Ag14.75Zr36Ti5 和 Ti32.8Zr30.2Cu9Ni5.3Be22.7的活化体积分别为 0.263∼0.486 nm3 和 1.261∼1.650 nm3,表明它们具有平均为 26∼48 和 91∼127 个原子的最小位移簇。因此,所研究的两种脆性 BMG 可在 SLR 中进行热塑性加工,并给出了变形图。与 Ti32.8Zr30.2Cu9Ni5.3Be22.7 相比,BMG Cu44.25Ag14.75Zr36Ti5 具有更好的可加工性。与韧性 BMG 相比,所研究的两种脆性 BMG 没有发现牛顿流体。
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The rheological behavior of brittle BMGs of Cu44.25Ag14.75Zr36Ti5 and Ti32.8Zr30.2Cu9Ni5.3Be22.7 in the supercooled liquid region

Bulk metallic glasses (BMGs) show limited plasticity at room temperature. However, BMGs usually exhibit superplasticity and high plastic forming ability in their supercooled liquid region (SLR). The rheological behavior of BMGs in SLR is vitally important to their thermoplastic forming process. In contrast to the ductile BMGs, thermoplastic deformation behavior of brittle BMGs is rarely reported. In present work, the rheological behavior of two brittle BMGs with high glass forming ability Cu44.25Ag14.75Zr36Ti5 and Ti32.8Zr30.2Cu9Ni5.3Be22.7 was investigated on Gleeble3500. The two BMGs can deform homogeneously depending on the temperature and strain rate. According to the high value of m (strain rate sensitivity index), which is the most important mechanical characteristic of a superplastic material, the two BMGs show superplasticity in their SLR with m ≥ 0.3. Based on the free volume model, their activation volumes are calculated as 0.263∼0.486 nm3 and 1.261∼1.650 nm3, indicating the minimum displacement clusters with average 26∼48 and 91∼127 atoms, for Cu44.25Ag14.75Zr36Ti5 and Ti32.8Zr30.2Cu9Ni5.3Be22.7, respectively. Thus, the two investigated brittle BMGs can be thermoplastic processed in the SLR and the deformation maps are given. BMG Cu44.25Ag14.75Zr36Ti5 shows better machinable property than Ti32.8Zr30.2Cu9Ni5.3Be22.7. Compared to the ductile BMGs, no Newtonian flow is found for the two investigated brittle BMGs.

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来源期刊
Journal of Non-crystalline Solids
Journal of Non-crystalline Solids 工程技术-材料科学:硅酸盐
CiteScore
6.50
自引率
11.40%
发文量
576
审稿时长
35 days
期刊介绍: The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.
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