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Microstructure and magnetic properties of FeCoZr(mo)BGe nanocrystalline alloys

Chinese Physics B 2025年第1期34卷 407-412页

作者： Wanqiu Yu Yanxiang Sun Lihua Liu Pingli Zhang College of Physics Jilin Normal UniversitySiping 136000China Chengxi Power Supply Company State Grid Tianjin Electric Power CompanyTianjin 300190China

The microstructure and magnetic properties of Fe40Co40Zr9B10Ge1(mo-free)and Fe_(40)Co_(40)Zr_(5)mo_(4)B_(10)Ge1(mocontaining)nanocrystalline alloys,prepared using an amorphous crystallization method,were *** addition affects the crystallization of the Fe_(40)Co_(40)Zr_(9)B_(10)Ge1amorphous alloy and decreases the grain size of theα-Fe(Co)phase below 650°*** the mo-free alloy annealed at 600°C and the mo-containing alloy annealed at 575°C,with a singleα-Fe(Co)crystallization phase and approximately similar crystallization volume fractions,the mo-containing alloy showed smaller,more regularly shaped grains and a significantly narrower grain-size distribution than the mo-free *** Fe and Co contents in the nanograins of the two alloys also *** the mo-free alloy,a higher concentration of Co distributed in the residual amorphous *** the mo-containing alloy,a higher concentration Co dissolved in the *** specific saturation magnetization and coercivity of the mo-free alloy were 1.05-and 1.59-times higher than those of the mo-containing alloy,respectively.

关键词： nanostructured materials mo addition microstructure grain size

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Effects of Nb and mo additions on thermal behavior, microstructure and magnetic property of FeCoZrBGe alloy

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Chinese Physics B 2021年第3期30卷 488-492页

作者： Yaming Sun Zhiqun Wang Shi-Chong Xu Zhong Hua National Demonstration Center for Experimental Physics Education Jilin Normal UniversitySiping 136000China State Grid Economic Research Institute of East Inner mongolia Electric Power Company Limited Hohhot 010020China

Both Nb and mo additions play a vital role in FeCo-based alloys and it is crucial to understand their roles and contents on thermal behavior,microstructural feature and magnetic property of *** alloy ribbons Fe40Co40Zr9−yMyB10Ge1(y=0–4;M=Nb,mo)were prepared by crystallizing the as-quenched amorphous *** effects of Nb and mo additions on structures and properties of the Fe40Co40Zr9B10Ge1 alloy are investigated systemically and *** increasing Nb or mo content,the primary crystallization temperature,grain size ofα-Fe(Co)phase and coercivity Hc all ***,the effect of mo addition on thermal behavior,microstructure and magnetic properties of the FeCoZrBGe alloy is greater compared to Nb *** gap between primary and secondary crystallization peaks of mo-containing alloys is wider than that of Nb-containing *** grain size and Hc of mo-containing alloys are smaller than those of Nb-containing *** Fe40Co40Zr9B10Ge1 alloy,high mo addition proportion is better compared to high Nb addition proportion.

关键词： alloy Nb addition mo addition transmission electron microscopy

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Impact of mo/Ni alloying on microstructural modulation and low-temperature toughness of high-strength low-alloy steel

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Journal of Iron and Steel Research International 2024年第7期31卷 1746-1762页

作者： Wei Liu Hong-li Zhao Bing-xing Wang Yong Tian State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The high-strength low-alloy steel plates with varying Ni/mo contents were manufactured using the thermos-mechanical control *** investigation was conducted to explore the effect of Ni/mo microalloying on microstructure evolution and mechanical properties of the *** results revealed that the increase in Ni content from 1 to 2 wt.%reduced the transition temperature of ferrite and the growth range of ferritic grain was narrowed,which promoted grain *** optimized combination of grain size,high-angle grain boundaries(HAGBs),and martensite-austenite(M-A)islands parameter contributed to the excellent impact toughness of S1 steel at-100℃(impact absorbed energy of 218.2 J at-100℃).As the mo increases from 0 to 2 wt.%,the matrix structure changes from multiphase structure to granular bainite,which increases the average effective grain size to~4.62 pm and reduces HAGBs proportion to~36.22%.With these changes,the low-temperature impact toughness of S3 steel is *** addition,based on the analysis of the characteristics of crack propagation path,it was found that M-A islands with low content(~2.21%)and small size(~1.76 pm)significantly retarded crack propagation,and the fracture model of M-A islands with different morphologies was further ***,correlation between behaviour of delamination and toughness was further analysed by observing delamination size and impact energy parameters.

关键词： High-strength low-alloy steel Microstructural regulation Ni addition mo addition Crack propagation Low-temperature toughness

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Microstructure and corrosion behavior of Zr–1.0Cr–0.4Fe–xmo alloys

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Rare Metals 2015年第2期34卷 118-124页

作者： Tian-Guo Wei Lu Zhang Zhi Miao Hong Liu Bai-Feng Luan Wen Wang Chong-Sheng Long Reactor Fuel and Materials Key Laboratory Nuclear Power Institute of China Nuclear and Radiation Safety Ministry of Environmental Protection Institute of Material Science and Technology Chongqing University

Possibility of using mo as an alloying element in Zr-based alloys was attractive in terms of microstructure refinement and mechanical properties strengthening. In this research, Zr–1.0Cr–0.4Fe–xmo（0, 0.2, 0.4, and 0.6） alloys with different mo contents were prepared by vacuum arcmelting method, the microstructure and the corrosion resistance of these alloys were investigated. addition of mo has a refinement effect on the microstructure; with the increase of mo content, the a-laths in the as-cast samples and the grain size in the annealed samples decrease. Zr–1.0Cr–0.4Fe–xmo alloys have large numbers of fine second-phase particles（SPPs） in the matrix, the area fraction of the SPPs is more than 10 %. With the increase of mo content, the population density of the SPPs increases significantly, while the average diameter of the SPPs decreases. mo addition also affects the texture; the intensity of basal pole texture aligning normal direction decreases with the increase of mo content in the *** with Zr-4 and Zr–1Nb, Zr–1.0Cr–0.4Fe–xmo alloys have excellent corrosion resistance in 500 ℃/10.3 MPa steam. The corrosion rates of mo-containing alloys are higher than that of mo-free alloy, which is mainly attributed to the solute mo atoms in the Zr *** of the SPPs features due to the increase of mo content alleviates the degradation of corrosion resistance in some degree, but it is not the dominant factor.

关键词： Zr-based alloys mo addition Microstructures Second-phase particles Corrosion behavior

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A revisit to the role of mo in an MP35N superalloy:An experimental and theoretical study

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Journal of Materials Science & Technology 2023年第26期157卷 60-70页

作者： Qing Cheng Jinyong mo Xiaoqing Li Xiandong Xu Center for High Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China Institute of Massive Amorphous Metal Science School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Department of Materials Science and Engineering Applied Materials Physics KTH-Royal Institute of TechnologyStockholm SE-10044Sweden

molybdenum(mo)has been recognized as an essential alloying element of the MP35N(Co_(35.4)Cr_(22.9)Ni_(35.5)mo_(6.2),at.%)superalloy for enhancing strength and corrosion ***,a full understanding of the addition of mo on microstructure and mechanical properties of the mo-free parent alloy is *** this work,we consider five(Co_(37.7)Cr_(24.4)Ni_(37.9))_(100-x)mo_(x)(x=0,0.7,2.0,3.2,and 6.2)alloys,and reveal that yield/tensile strength and ductility are continuously increased for these alloys with increasing mo content while a single-phase face-centered cubic structure remains *** is found that strong solid solution strengthening(SSS)is a main domain to the improved yield strength,whereas grain boundaries are found to soften by the mo *** first-principles calculations demonstrate that a severe local lattice distortion contributes to the enhanced SSS,and the grain boundary softening effect is mostly associated with the decreased shear *** first-principles calculations and scanning transmission electron microscopy observations reveal that the stacking fault energy(SFE)reduces by the mo *** calculated SFE value decreases from 0.4 mJ/m^(2) to-11.8 mJ/m^(2) at 0 K as mo content increases from 0 at.%to 6.2 at.%,and experimentally measured values of SFE at room temperature for both samples are about 18 mJ/m^(2) and 9 mJ/m^(2),*** reduction of SFE promoted the generation of stacking faults and deformation twins,which sustain a high strain hardening rate,thus postponing necking instability and enhancing tensile strength and elongation.

关键词： mo addition Solid solution strengthening Grain boundary softening Local lattice distortion First-principles simulations Stacking fault energy Deformation twin

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