A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength.
A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength.
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DOI：
10.1126/sciadv.aat8712
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发表时间：
2018-10
期刊：
影响因子：
13.6
通讯作者：
Lavernia EJ
中科院分区：
文献类型：
--
作者：
Fu Z;Jiang L;Wardini JL;MacDonald BE;Wen H;Xiong W;Zhang D;Zhou Y;Rupert TJ;Chen W;Lavernia EJ
HEA的成分空间允许设计有助于卓越强度值的分层微观结构。高熵合金（HEAs）是一种金属材料，具有革命性的合金设计。它们以其高压缩强度而闻名，通常大于1 GPa;然而，大多数报告的HEA的拉伸强度是有限的。在这里，我们报告的HEAs的设计和制造策略，可以实现抗拉强度。所提出的策略涉及引入高密度的分级颗粒内纳米沉淀物。为了建立这种策略的有效性，我们设计并制造了一个散装的Fe 25 Co25 Ni 25 Al 10 Ti 15 HEA由一个主要的面心立方（fcc）相包含分级的晶内纳米沉淀物。结果表明，作为主要强化机制之一的沉淀强化使HEA室温拉伸屈服强度σ0.2达到约1.86 GPa，极限拉伸强度达到约2.52 GPa，是迄今为止HEA的最高强度，其断裂应变约为5.2%。
HEAs’ compositional space allows the design of hierarchical microstructures that contribute to the exceptional strength values. High-entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths, often greater than 1 GPa; however, the tensile strengths of most reported HEAs are limited. Here, we report a strategy for the design and fabrication of HEAs that can achieve ultrahigh tensile strengths. The proposed strategy involves the introduction of a high density of hierarchical intragranular nanoprecipitates. To establish the validity of this strategy, we designed and fabricated a bulk Fe25Co25Ni25Al10Ti15 HEA to consist of a principal face-centered cubic (fcc) phase containing hierarchical intragranular nanoprecipitates. Our results show that precipitation strengthening, as one of the main strengthening mechanisms, contributes to a tensile yield strength (σ0.2) of ~1.86 GPa and an ultimate tensile strength of ~2.52 GPa at room temperature, which heretofore represents the highest strength reported for an HEA with an appreciable failure strain of ~5.2%.
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影响因子：
9.4
作者：
Senkov, O. N.;Senkova, S. V.;Woodward, C.
通讯作者：
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影响因子：
9.4
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10.1016/j.msea.2005.03.082
发表时间：
2005-07-25
影响因子：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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