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Effects of temperature and rare earth content on oxidation resistance of Ni-based superalloy

Progress in Natural Science:Materials International 2011年第3期21卷 227-235页

作者： Xiu SONG~1,Lei WANG~1,Yang LIU~1,Hui-ping MA~2 1.Key laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110004,China 2.Department of High-temperature Materials,Central Iron & Steel Research Institute,Beijing 100081,China Key laboratory for Anisotropy and Texture of Materials Northeastern University Shenyang 110004 China Department of High-temperature Materials Central Iron & Steel Research Institute Beijing 100081 China

The oxidation behaviors of the Ni-22Cr-14W-2Mo superalloys with various la contents were investigated at 1 000℃and 1 100℃up to 500 h.The experimental results show that the oxidation resistance is improved by la addition.The mechanism of the reactive-element effect(REE) exhibits some difference at various oxidation temperatures.The REE is dependent on the solutionized la content when the alloy is oxidized at 1 000℃.The dispersed laCrO3segregates on the grain boundaries of Cr-oxides.and hence the diffusion of metallic ions,e.g.,Mn2+and Cr3+,are prevented.The oxidation resistance decreases with the increase of la content. However,the REE ascribes not only to the solutionized la,but also to the la-Ni intermetallic phases,when the alloy is oxidized at 1 100℃.The oxidation resistance is influenced by two effects:firstly,the formation of the dispersed la2O3from the solutionized la on the grain boundary of Cr-oxides reduces the oxidation rate,and secondly,the aggregation of the la-O oxides from the large amount of la-Ni phases accelerates the oxidation process.The alloy with 0.026%la(mass fraction) exhibited excellent oxidation resistance at 1 100℃.

关键词： Ni-based superalloy isothermal oxidation rare earth la oxidation resistance

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Effect of la on microstructure,mechanical properties and fracture behavior of Al/Mg bimetallic interface manufactured by compound casting

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Journal of Materials Science & Technology 2022年第10期105卷 214-225页

作者： Zheng Zhang Wenming Jiang Guangyu Li Junlong Wang Feng Guan Guoliang Jie Zitian Fan State Key laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

To improve the Al/Mg bimetallic interface,la was added into the Al/Mg bimetallic interface manufactured by a compound casting process.The effect of la addition on the microstructure,mechanical properties and fracture behavior of the Al/Mg bimetallic interface and the formation mechanism of the interface were studied in detail.Al_(11)la_(3),Al_(8)Mn_(4)la,Al_(20)Ti_(2)la,and other rare earth precipitates(RE precipitates)preferentially precipitated at the interface with la addition,while the number of the Al_(11)la_(3)and Al_(8)Mn_(4)la located in eutectic structure area(E area)gradually increased and aggregated in the interface with the increase of the la content.Besides,the matrix structure in different areas of the Al/Mg interface changed in different degrees,and the eutectic structure and primaryγ(Mg_(17)Al_(12))dendrites in the E area were refned,but the intermetallic compounds area(IMC area)had no obvious change.With the addition of the la,the interface was strengthened under the comprehensive effect of refnement strengthening and precipitation strengthening from the E area.When the la content increased to 1.0%,the shear strength of the Al/Mg bimetal reached the maximum of 51.54 MPa,which was 30.95%higher than the group without la addition.However,with the further increase of the la content,the large area aggregation of the Al_(11)la_(3)and Al_(8)Mn_(4)la occurred in the interface,leading to the separation of the matrix structure of the E area and the decrease of the shear strength of the Al/Mg interface.

关键词： Compound casting Al-Mg intermetallic compounds rare earth la Al/Mg interface Microstructure Mechanical properties

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Preparation of Al–la master alloy by ultrasonic method and modification on Al alloy

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rare Metals 2015年第7期34卷 457-462页

作者： Hong Yan Xian-Chen Song Xin Huang Department of Materials Processing Engineering School of Mechanical and Electrical EngineeringNanchang University

In this study, two kinds of Al–la master alloys were prepared by ultrasonic method and ordinary mixmelting method, and both of the alloys were added into the Al alloy.Then, the microstructure of Al–la master alloy and the modification effect on the Al alloy were investigated using optical microscope(OM), X-ray diffraction(XRD), scanning electron microscope(SEM), and energy disperse spectroscopy(EDS).The results show that because of ultrasonic cavitation and streaming, the grain size of Al–la master alloy prepared by the ultrasonic method is refined, which distributes evenly.And, there is no gas hole,inclusion, or segregation in the Al–la master alloy with aAl, la, and la3Al11.Furthermore, Al–la master alloys show a nice modification for Al alloy, which is much better than that prepared by ordinary mix-melting method.

关键词： rare earth la Master alloy Al alloy Ultrasonic

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