Xuanjiang Lai , Yaojia Ren , Qingge Wang , Shaohua Xing , Cheng Xu , Jian Hou , Ian Baker , Hong Wu
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引用次数: 0
摘要
通过电弧熔炼成功制备了具有优异耐磨性和高硬度的铝铜铁钛高熵合金。系统研究了退火对合金微观结构、纳米力学性能、摩擦学性能和耐腐蚀性能的影响。结果表明，AlCoCuFeTi 由 Co 富集的 L21 相、Cu 富集的 FCC 相和 (Fe, Ti) 富集的 Laves 相组成。退火促进了 FCC 相和 Laves 相的形成，但降低了 L21 相的体积分数。AlCoCuFeTi 的高硬度归因于 L21 和 Laves 相的形成。1100 °C 退火和 900 °C 退火试样的硬度（14.1 ± 1.3 GPa）和杨氏模量（256 ± 11 GPa）分别最高。由于存在轻度氧化磨损机制，与典型的 HEA 相比，所有试样都表现出优异的耐磨性。1100 °C 退火试样具有最高的失效弹性应变（H/Er）和屈服压力（H3/Er2），这与其最佳耐磨性的测量结果相对应。在极化试验中，铜的偏析导致了电化学腐蚀，阴阳极面积比（Ac/Aa）决定了腐蚀速率。1100 °C 退火试样由于 Ac/Aa 值较低而表现出良好的耐腐蚀性。
Effect of annealing on microstructure and properties of AlCoCuFeTi high-entropy alloy fabricated by arc melting
An AlCoCuFeTi high-entropy alloy with excellent wear resistance and high hardness was successfully produced by arc melting. The effects of annealing on the microstructure, nanomechanical behaviors, tribological properties, and corrosion resistance were systematically investigated. The results showed that the AlCoCuFeTi consisted of a Co-enriched L21 phase, a Cu-enriched FCC phase, and a (Fe, Ti)-enriched Laves phase. Annealing promoted the formation of FCC and Laves phases but decreased the volume fraction of the L21 phase. The high hardness of AlCoCuFeTi is attributed to the formation of L21 and Laves phases. The highest hardness (14.1 ± 1.3 GPa) and reduced Young's modulus (256 ± 11 GPa) were achieved in the 1100 °C annealed and 900 °C annealed specimens, respectively. All specimens exhibited excellent wear resistance compared to typical HEAs due to the mild-oxidational wear mechanism. The 1100 °C annealed specimen possessed the highest elastic strain to failure (H/Er) and yield pressure (H3/Er2), corresponding to its best-measured wear resistance. The segregation of Cu led to galvanic corrosion during the polarization tests, and the area ratio of cathode to anode (Ac/Aa) determined the corrosion rate. The 1100 °C annealed specimen exhibited good corrosion resistance due to its low Ac/Aa value.
期刊介绍：
This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
The journal reports the science and engineering of metallic materials in the following aspects:
Theories and experiments which address the relationship between property and structure in all length scales.
Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations.
Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties.
Technological applications resulting from the understanding of property-structure relationship in materials.
Novel and cutting-edge results warranting rapid communication.
The journal also publishes special issues on selected topics and overviews by invitation only.
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