镁-稀土合金中Ca向亚稳沉淀物的分配

IF 8.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Letters Pub Date : 2022-11-03 DOI:10.1080/21663831.2022.2138724

Q. Shi, A. Natarajan, A. Van der Ven, J. Allison

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引用次数: 2

摘要

研究了Ca元素对镁-稀土合金中沉淀行为的潜在影响。在200°C的峰值老化条件下，观察到亚稳β′′′和β′沉淀物的组合。Ca的添加对沉淀相和析出顺序没有显著影响。成分分析表明，Ca分配到β′′和β′沉淀相。第一性原理计算表明，Ca在沉淀相中向稀土亚晶格分配。这一发现表明，Ca有可能部分取代沉淀硬化镁稀土合金中昂贵的稀土元素。图形摘要影响声明Mg-Nd-Y-Ca合金的实验研究和第一次主计算都揭示了非稀土元素Ca向Mg-RE沉淀物的分配，表明Ca有可能增强沉淀和强度。

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Partitioning of Ca to metastable precipitates in a Mg-rare earth alloy

The potential effect of the element Ca on the precipitation behavior was investigated in an Mg-rare earth alloy. A combination of metastable β′′′ and β′ precipitates was observed for the peak aging condition at 200°C. Ca addition was found to have no significant effect on the precipitating phases and evolution sequence. Composition analysis showed that the Ca partitioned to both β′′′ and β′ precipitate phases. First-principles calculations indicated that Ca partitions to the rare-earth sublattice in the precipitate phase. This finding suggests the potential of Ca to partially replace costly rare-earth elements in precipitation-hardened Mg-rare earth alloys. GRAPHICAL ABSTRACT IMPACT STATEMENT Both experimental investigation and first-principal calculation in a Mg-Nd-Y-Ca alloy revealed the partitioning of non-rare-earth element Ca to Mg-RE precipitates, suggesting the potential of Ca to enhance precipitation and strength.

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来源期刊

Materials Research Letters Materials Science-General Materials Science

CiteScore

12.10

自引率

3.60%

发文量

审稿时长

3.3 months

期刊介绍： Materials Research Letters is a high impact, open access journal that focuses on the engineering and technology of materials, materials physics and chemistry, and novel and emergent materials. It supports the materials research community by publishing original and compelling research work. The journal provides fast communications on cutting-edge materials research findings, with a primary focus on advanced metallic materials and physical metallurgy. It also considers other materials such as intermetallics, ceramics, and nanocomposites. Materials Research Letters publishes papers with significant breakthroughs in materials science, including research on unprecedented mechanical and functional properties, mechanisms for processing and formation of novel microstructures (including nanostructures, heterostructures, and hierarchical structures), and the mechanisms, physics, and chemistry responsible for the observed mechanical and functional behaviors of advanced materials. The journal accepts original research articles, original letters, perspective pieces presenting provocative and visionary opinions and views, and brief overviews of critical issues.