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采用球磨法制备了添加1%质量分数的纳米Y_2O3的GH4169复合粉末，并利用选区激光熔化(SLM)技术成形合金试样，系统研究了Y_2O3对GH4169合金微观组织及高温力学性能的影响。结果表明，Y_2O3/GH4169合金中Y_2O3颗粒平均尺寸为49.82 nm，质量分数约为0.53%。在650℃下高温拉伸条件下，Y_2O3/GH4169合金的抗拉强度和屈服强度均显著高于GH4169合金，这主要归因于高温下Y_2O3颗粒与合金基体之间界面的良好结合以及Y_2O3纳米颗粒对位错的有效钉扎。此外，在650℃、720 MPa应力下的高温蠕变条件下，Y_2O3/GH4169合金的持续时间较GH4169合金提升6.89倍，塑性延伸率提高约14.33倍，显示出优异的抗高温蠕变性能。
Abstract：This study prepared GH4169 composite powder with 1% nano-Y_2O3 addition via ball milling and fabricated alloy samples using selective laser melting(SLM),systematically investigating the effects of Y_2O3 on the microstructure and high-temperature mechanical properties of GH4169 alloy. The results indicate that the average size of Y_2O3 particles in the Y_2O3/GH4169 alloy is 49. 82 nm,with a mass fraction of approximately 0. 53%. Under high-temperature tensile conditions at 650 ℃,the ultimate tensile strength and yield strength of the Y_2O3/GH4169 alloy were significantly higher than those of the GH4169 alloy,which is mainly attributed to the improved interfacial bonding between the Y_2O3 particles and the alloy matrix at elevated temperatures,as well as the effective pinning of dislocations by the Y_2O3 nanoparticles. Furthermore,under high-temperature creep conditions at 650 ℃ and 720 MPa stress,the creep duration of the Y_2O3/GH4169 alloy increased by 6. 89 times,and the plastic elongation improved by approximately 14. 33 times compared to the GH4169 alloy,demonstrating excellent resistance to high-temperature creep.
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基本信息:
DOI：10.20240/j.rptjs.2025.04.003
中图分类号:TG132.3
引用信息:
[1]欧阳佩旋,袁一,韩英杰,等.纳米Y_2O_3对SLM-GH4169合金性能的影响[J].热喷涂技术,2025,17(04):20-29.DOI:10.20240/j.rptjs.2025.04.003.
基金信息:
国家自然科学基金资助项目(52305328); 国家科技重大专项项目(2024ZD0705101)
2025-12-25
2025-12-25