时效工艺对QBe2.0合金微观组织和弹性后效行为的影响机制

doi:10.19976/j.cnki.43-1448/TF.2025087

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Abstract Under high-frequency insertion and extraction and vibrational conditions, the presence of elastic after-effect results in unstable contact stress of electrical connectors and consequently degrades transmission performance and transfer efficiency. In this work, QBe2.0 alloy was subjected to single and double stage aging treatments. The microstructure and elastic after-effect behavior of QBe2.0 alloy under different aging conditions were investigated using scanning electron microscope, X-ray diffractometer, transmission electron microscope, and high-frequency testing machine, and the underlying strengthening mechanism was elucidated. The results show that the elastic after-effect performance of QBe2.0 alloy is optimized under double-stage aging at 240  ℃/150  min+290 ℃/180  min, with an elastic after-effect value of 2.83%. Compared with single-stage aging, this optimized process promotes the formation of fine and homogeneous γ′ precipitates. These precipitates effectively pin dislocations, shorten the length of dislocation free segments, increase the energy barrier for dislocation migration, and reduce both the amplitude and characteristic time scale of dislocation rebound, thereby significantly suppressing elastic after-effect. This study provides theoretical foundations and practical process guidance for developing elastic components suitable for high-performance electrical connectors.

Key words： QBe2.0 double-stage aging treatment single-stage aging treatment elastic after-effect microstructure

Received: 25 December 2025 Published: 07 May 2026

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	LIANG Weihan
	LIU Ziyi
	WANG Xing
	XU Yuxuan
	CHEN Deshan
	YAO Pingping

Cite this article:

LIANG Weihan,LIU Ziyi,WANG Xing, et al. Effects of aging treatments on the microstructure and elastic after-effect behavior of QBe2.0 alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(2): 155-162.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025087 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I2/155

[1] NAGEL N.Beryllium and copper-beryllium alloys[J]. ChemBioEng Reviews, 2018, 5(1): 30-33.
[2] REIS T M, BOEIRA C D, SERAFINI F L, et al.Micro-abrasive wear resistance of heat-treated electroless nickel-phosphorus coatings deposited on copper-beryllium alloy C17200[J]. Surface and Coatings Technology, 2022, 438: 128374.
[3] CAO J, LI C, SUN Y Z, et al.Study on the effect of heat treatment on the microstructure and properties of C17300 beryllium copper alloy microwires[J]. Journal of Materials Research and Technology, 2023, 25: 6578-6592.
[4] 王晶莉, 岳丽娟, 闫永, 等. 低温时效对QBe2.0铍青铜组织与性能的影响[J]. 有色金属科学与工程, 2018, 9(3): 17-21.
WANG Jingli, YUE Lijuan, YAN Yong, et al.Effects of low temperature aging on the microstructure and properties of QBe2.0 alloy[J]. Nonferrous Metals Science and Engineering, 2018, 9(3): 17-21.
[5] WANG Z, LI J, ZHANG Y, et al.Comparison of the mechanical properties and microstructures of QB2.0 and C17200 alloys[J]. Materials, 2022, 15(7): 2570.
[6] WATANABE C, SAKAI T, MONZEN R.Misfit strains of precipitated phases and dimensional changes in Cu-Be alloys[J]. Philosophical Magazine, 2008, 88(9): 1401-1410.
[7] YAGMUR L.Effect of microstructure on internal friction and Young’s modulus of aged Cu-Be alloy[J]. Materials Science and Engineering A, 2009, 523(1/2): 65-69.
[8] 谢韵雅. 航空电连接器接触件研究[J]. 航空维修与工程, 2024(2): 60-62.
XIE Yunya.Research on contact parts of aviation military connectors[J]. Aviation Maintenance & Engineering, 2024(2): 60-62.
[9] MA Z P, ZHOU M, TIAN B H, et al.Nano-Y₂O₃ effects on the electrical contact properties of Al₂O₃-Cu/35Cr3TiB₂ composites[J]. Materials Characterization, 2024, 207: 113474.
[10] CHEN Z P, YANG Y, LOU H F, et al.Effects of the grain size, boundary type and texture on the bending properties of phosphorus bronze strips[J]. Materials Characterization, 2025, 225: 115090.
[11] 文保华, 徐凤林, 赵华, 等. 三轴随机振动条件下电连接器插孔簧片疲劳损伤研究[J]. 机械强度, 2023, 45(6): 1465-1473.
WEN Baohua, XU Fenglin, ZHAO Hua, et al.Research on fatigue damage of electrical connector jack springs under triaxial random vibration conditions[J]. Journal of Mechanical Strength, 2023, 45(6): 1465-1473.
[12] 胡磊, 肖志瑜, 付文超, 等. Mn含量对Fe-Cu-Mn-C系烧结合金组织和性能的影响[J]. 粉末冶金材料科学与工程, 2013, 18(6): 821-826.
HU Lei, XIAO Zhiyu, FU Wenchao, et al.Effect of manganese content on microstructure and properties of Fe-Cu-Mn-C sintering alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2013, 18(6): 821-826.
[13] WANG X G, SUN M, LIU X Q, et al.Ultrabroad distribution of multiple anelasticities in O-doped refractory multiprincipal element alloys[J]. Acta Materialia, 2024, 271: 119911.
[14] GOLOVIN I S, MOHAMED A K, PALACHEVA V V, et al.Mechanical spectroscopy of phase transitions in Fe-(23-38)Ga-RE alloys[J]. Journal of Alloys and Compounds, 2021, 874: 159882.
[15] HUANG X X, XIE G L, LIU X H, et al.The influence of precipitation transformation on Young’s modulus and strengthening mechanism of a Cu-Be binary alloy[J]. Materials Science and Engineering A, 2020, 772: 138592.
[16] REN P H, XIAO L R, CAI Z Y, et al.Micromechanical properties and creep behavior of instrument-grade beryllium after different stabilizing heat treatments[J]. Materials Letters, 2025, 383: 138007.
[17] MONTECINOS S, TOGNANA S, SALGUEIRO W.Influence of microstructure on the Young’s modulus in a Cu-2Be (wt%) alloy[J]. Journal of Alloys and Compounds, 2017, 729: 43-48.
[18] PERSSON B N J. On the electric contact resistance[J]. Tribology Letters, 2022, 70(3): 88.
[19] BARAZ V R, ESTEMIROVA S X, ISHINA E A.The microstructural peculiarities of beryllium bronze after heat treatment[J]. Materials Science Forum, 2020, 989: 172-176.
[20] 刘俊伟, 刘军, 鲁世强, 等. 分级时效对QBe2铍青铜力学性能及微观组织的影响[J]. 特种铸造及有色合金, 2018, 38(3): 345-348.
LIU Junwei, LIU Jun, LU Shiqiang, et al.Effects of multi-step aging on mechanical properties and microstructure of QBe2 beryllium bronze[J]. Special Casting & Nonferrous Alloys, 2018, 38(3): 345-348.
[21] 李海梅, 刘在栋, 乔志炜, 等. 热处理对薄层化C/C复合材料微观结构和力热性能的影响[J]. 粉末冶金材料科学与工程, 2025, 30(5): 433-445.
LI Haimei, LIU Zaidong, QIAO Zhiwei, et al.Effects of heat treatment on microstructure and thermo-mechanical properties of thin-layered C/C composites[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(5): 433-445.
[22] MARTÍNEZ-CRUZ M A, RAMOS-SÁNCHEZ G, OLIVER-TOLENTINO M, et al. Improving the structural reversibility of LiNiO₂ by incorporation of Cu, an electrochemical and in-situ XRD study[J]. Journal of Alloys and Compounds, 2022, 923: 166328.
[23] ZHANG H T, JIANG Y B, XIE J X, et al.Precipitation behavior, microstructure and properties of aged Cu-1.7 wt% Be alloy[J]. Journal of Alloys and Compounds, 2019, 773: 1121-1130.
[24] CAO Z H, XU L J, SUN W, et al.Size dependence and associated formation mechanism of multiple-fold annealing twins in nanocrystalline Cu[J]. Acta Materialia, 2015, 95: 312-323.
[25] ZHOU Y J, SONG K X, XING J D, et al.Precipitation behavior and properties of aged Cu-0.23Be-0.84Co alloy[J]. Journal of Alloys and Compounds, 2016, 658: 920-930.
[26] DONG Y H, ZHANG D, LI D G, et al.Control of Ostwald ripening[J]. Science China Materials, 2023, 66(3): 1249-1255.