The under-oxidized condition (insufficient internal oxidation) for Ag-0.20Mg-0.19Ni (in wt-%) alloy was conducted at 650°C for 2 h, and the microstructural evolution in the alloy was investigated. The average grain size of the oxidized region and the unoxidized region are 3.82 µm and 3.86 m, respectively. The results suggest that the oxides enriched at grain boundaries do not hinder grain growth in the under-oxidized condition. The hardness of the oxidized region increases significantly, while the hardness of the unoxidized region decreases due to recrystallization. Both the number and the distribution area of MgO precipitates at the grain boundaries are increased with the internal oxidation time. Additionally, small MgO precipitates merge to form larger oxide particles with the internal oxidation time.
StottFH, WoodGC.Internal oxidation. Mater Sci Technol. 1988;4(12):1072–1078. doi:10.1179/mst.1988.4.12.1072
2.
WuCP, YiDQ, WengW, . Influence of alloy components on arc erosion morphology of Ag/MeO electrical contact materials. Trans Nonferrous Met Soc China. 2016;26(1):185–195. doi:10.1016/S1003-6326(16)64105-5
3.
WangJ, KangYQ, WangC, . Resistance to arc erosion characteristics of CuO skeleton-reinforced Ag-CuO contact materials. J Alloy Compd. 2018;756:202–207. doi:10.1016/j.jallcom.2018.05.018
4.
ChenS, GuanWM, ZhangKH, . Experiment and finite element method analysis mass erosion and transfer of Ag/La2NiO4-based electrical contacts during operation. Rare Met. 2013;32(1):93–99. doi:10.1007/s12598-013-0005-5
5.
KesimMT, YuH, SunY, . Corrosion, oxidation, erosion and performance of Ag/W-based circuit breaker contacts: a review. Corros Sci. 2018;135:12–34. doi:10.1016/j.corsci.2018.02.010
6.
ChenSY, WangJ, YuanZ, . Microstructure and arc erosion behaviors of Ag-CuO contact material prepared by selective laser melting. J Alloy Compd. 2021;860:158494. doi:10.1016/j.jallcom.2020.158494
7.
WuCP, YiDQ, LiJ, . Investigation on microstructure and performance of Ag/ZnO contact material. J Alloy Compd. 2008;457(1–2):565–570. doi:10.1016/j.jallcom.2007.03.099
8.
XuCH, YiDQ, JiangY, . The kinetics and interface microstructure evolution in the internal oxidation of Ag-3at.%Sn alloy. Corros Sci. 2015;94:392–400. doi:10.1016/j.corsci.2015.02.020
9.
WangJB, ZhangY, YangMG, . Observation of arc discharging process of nanocomposite Ag-SnO2 and La-doped Ag-SnO2 contact with a high-speed camera. Mater Sci Eng B. 2006;131(1–3):230–234. doi:10.1016/j.mseb.2006.04.042
10.
KongJW, ShiQN, WangJH, . Microstructure and properties of Ag-1.33%Mg-0.54%Ni alloy after severe plastic deformation and internal oxidation. Rare Metal Mater Eng. 2013;42(1):32–36. doi:10.1016/S1875-5372(13)60033-8
11.
ĆosovićV, ĆosovićA, TalijanN, . Improving dispersion of SnO2 nanoparticles in Ag-SnO2 electrical contact materials using template method. J Alloy Compd. 2013;567:33–39. doi:10.1016/j.jallcom.2013.03.094
12.
WagnerC.Theoretical analysis of the diffusion processes determining the oxidation rate of alloys. J Electrochem Soc. 1952;99(10):369–380. doi:10.1149/1.2779605
13.
StottFH, WoodGC, WhittleDP, . The transport of oxygen to the advancing internal oxide front during internal oxidation of nickel-base alloys at high temperature. Solid State Ionics. 1984;12:365–374. doi:10.1016/0167-2738(84)90166-8
14.
Martinez-VillafaneA, StottFH, Chacon-NavaJG, . Enhanced oxygen diffusion along internal oxide-metal matrix interfaces in Ni-Al alloys during internal oxidation. Oxid Met. 2002;57(3/4):267–279. doi:10.1023/A:1014874202052
15.
KlutheC, Al-KassabT, BarkerJ, . Segregation of hydrogen at internal AgMgO (metal/oxide)-interfaces as observed by small angle neutron scattering. Acta Mater. 2004;52(9):2701–2710. doi:10.1016/j.actamat.2004.02.018
16.
KlutheC, Al-KassabT, KirchheimR.Tomographic atom probe investigation of MgO precipitates in silver. Mater Sci Eng A. 2002;327(1):70–75. doi:10.1016/S0921-5093(01)01878-0
17.
GhaffariY, DaubK, NewmanRC, . Internal oxidation of Ag-xIn alloys at low homologous temperature. Corros Sci. 2020;175:108869. doi:10.1016/j.corsci.2020.108869
18.
CharrinL, Becquart-GallissianA, CombeA, . Reactivity at macroscopic, meso and microscopic scale in oxidized silver magnesium alloys. Scripta Mater. 2000;42(7):701–709. doi:10.1016/S1359-6462(99)00406-6
19.
HeJH, ShengHW, SchillingPJ, . Amorphous structures in the immiscible Ag-Ni system. Phys Rev Lett. 2001;86(13):2826–2829. doi:10.1103/PhysRevLett.86.2826
20.
XuJ, HerrU, KlassenT, . Formation of supersaturated solid solutions in the immiscible Ni-Ag system by mechanical alloying. J Appl Phys. 1996;79(8):3935–3945. doi:10.1063/1.361820
21.
YangWY, XieM, ChenYT, . Microstructure and phase analysis of Ag-Mg-Ni alloy. Chin J Rare Met. 2016;40(10):969–975. doi:10.13373/j.cnki.cjrm.xy15041602.
22.
CharrinL, Becquart-GallissianA, CombeA, . Key experimental parameters for internal-band formation: relationship between stress and oxidation kinetics in silver-magnesium alloys. Oxid Met. 2002;57(1):81–98. doi:10.1023/A:1013342712546
23.
ProrokBC, GorettaKC, ParkJH, . Oxygen diffusion and internal oxidation of Mg in Ag/1.12at.%Mg. Physica C. 2002;370(1):31–38. doi:10.1016/S0921-4534(01)00953-4
24.
ZhouXL, CaoJC, LiJT, . Effect of severe plastic deformation on microstructures and properties of AgCuO composites. Adv Mater Res. 2011;177:49–53. doi:10.4028/www.scientific.net/AMR.177.49
25.
XuGL, PengLJ, HuangGJ, . Microstructural evolution and properties of a Cu-Cr-Ag alloy during continuous manufacturing process. Rare Met. 2021;40:2213–2220. doi:10.1007/s12598-019-01238-x
26.
SakaiY, YamadaT, SuzukiT, . Contrast mechanisms in scanning ion microscope imaging for metals. Appl Phys Lett. 1998;73(5):611–613. doi:10.1063/1.121872
27.
XuCH, YiDQ, WuCP, . Microstructures and properties of silver-based contact material fabricated by hot extrusion of internal oxidized Ag-Sn-Sb alloy powders. Mater Sci Eng A. 2012;538:202–209. doi:10.1016/j.msea.2012.01.031
28.
ProrokBC, ParkJH, GorettaKC, . Hardness and microstructure of internally oxidized silver alloys. IEEE T Appl Supercon. 2000;10(1):1178–1181. doi:10.1109/77.828444
29.
LiZY, GuoXT, HuangK, . Failure analysis of an Ag-Mg-Ni reed in a relay in aircraft applications. Eng Fail Anal. 2022;131:105807. doi:10.1016/j.engfailanal.2021.105807
30.
RappRA.Kinetics, microstructures and mechanism of internal oxidation-its effect and prevention in high temperature alloy oxidation. Corrosion. 1965;21(12):382–401. doi:10.5006/0010-9312-21.12.382
31.
YeDL, HuJH.Handbook of thermodynamic data for practical inorganic materials. Beijing: Metallurgical Industry Press; 2002; Chinese.
32.
VillainS, CabanéJ, KnauthP.Solid state electrochemical characterisation of nanostructured silver prepared by cold-rolling and internal oxidation. Scripta Mater. 1998;38(6):1003–1007. doi:10.1016/S1359-6462(97)00556-3
33.
CharrinL, CombeA, CabaneJ.Oxide particles in Ag-Mg alloys formed by internal oxidation. Oxid Met. 1992;37(1):65–80. doi:10.1007/BF00665631
34.
SemegaBM, CharrinL, CombeA, . Evolution of the structure of precipitates during internal oxidation of Ag-0.4 at.% Mg alloy. Philos Mag A. 1992;66(6):1139–1148. doi:10.1080/01418619208248010
35.
SabioniACS, HuntzAM, MillotF, . Self-diffusion in Cr2O3 III. chromium and oxygen grain-boundary diffusion in polycrystals. Philos Mag A. 1992;66(3):361–374. doi:10.1080/01418619208201562
