黄元盛,温立哲.退火处理对 Al3CoCrCu1/2FeMoNiTi 高熵合金激光涂层组织和性能的影响[J].表面技术,2016,45(7):162-166.
HUANG Yuan-sheng,WEN Li-zhe.Effect of Annealing on the Microstructure and Property of Al3CoCrCu1/2FeMoNiTi High-entropy Alloy Laser Coating[J].Surface Technology,2016,45(7):162-166 |
| 退火处理对 Al3CoCrCu1/2FeMoNiTi 高熵合金激光涂层组织和性能的影响 |
| Effect of Annealing on the Microstructure and Property of Al3CoCrCu1/2FeMoNiTi High-entropy Alloy Laser Coating |
| 投稿时间：2016-03-30 修订日期：2016-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.027 |
| 中文关键词: 高熵合金 退火 激光熔覆 时效硬化 硬度 固溶强化 位错 |
| 英文关键词:high-entropy alloy annealing laser cladding age hardening hardness solid solution strengthening dislocation |
| 基金项目:广东省自然科学基金（2014A030313784）；江门市科技计划项目（2014—2016） |
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| 中文摘要: |
| 目的 研究 Al3CoCrCu1/2FeMoNiTi 高熵合金涂层的退火时效硬化及其强化机理。 方法 使用激光熔覆设备，在 40Cr 钢上制备了 Al3CoCrCu1/2FeMoNiTi 高熵合金涂层，对涂层进行了退火处理。使用X 射线衍射仪、扫描电子显微镜和显微硬度计对涂层进行了分析。结果 涂覆态涂层为 BCC 单相结构，经 300 ℃和 500 ℃退火，涂层仍然为 BCC 单相；700 ℃退火后，涂层析出了 NiTi 金属间化合物相；900 ℃退火后，涂层由 FCC 相及 NiTi 金属间化合物组成。涂覆态和经 300~700 ℃退火的涂层为胞粒状，经900 ℃退火后，涂层为板条状。经 300 ℃退火，涂层硬度下降， 但超过 300 ℃退火，硬度比涂覆态的高。700 ℃退火合金硬度达到最大值 924HV。退火温度升到 900 ℃后，硬度比 700 ℃退火的低。 NiTi 析出相促进了硬度提高，位错强化机制能较好解释该高熵合金的固溶强化现象。结论 Al3CoCrCu1/2FeMoNiTi合金涂层具有明显的时效硬化效应， 700 ℃退火可获得最佳的时效硬化效果。 |
| 英文摘要: |
| Objective To investigate the annealing age hardening of Al3CoCrCu1/2FeMoNiTi high-entropy alloy coating and strengthening mechanism. Methods Al3CoCrCu1/2FeMoNiTi high-entropy alloy coating was deposited on 40Cr steel with laser cladding equipment, and then was annealed. X-ray diffractometer, scanning electron microscope and microhardness tester were employed to analyze microstructure and hardness. Results The original coating was of BCC single-phase structure. After annealing at 300 ℃ and 500 ℃, the coating was still of BCC structure. The coating annealed at 700 ℃ precipitated NiTi intermetallic compound phase. When the annealing temperature was 900 ℃, the coating was composed of FCC phase and NiTi. The coating SEM morphology that was annealed at 0~700 ℃ was granular. After annealing at 900 ℃, the morphology was like lath. The coating annealed at 300 ℃ had a lower hardness than that of non-annealed. The hardness increased when the annealing temperature was more than 300 ℃. It reached the highest about 924HV at 700 ℃. It then became lower at 900 ℃. NiTi phase precipitating improved the alloy hardness. Solid solution strengthening of high-entropy alloys could be explained by dislocation strengthening mechanism. Conclusion Al3CoCrCu1/2FeMoNiTi high-entropy alloy coating obviously shows age hardening effect. The alloy coating has the best hardness after annealing at 700 ℃. |
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