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Effect of neodymium and yttrium addition on microstructure and DC soft magnetic property of dual-phase FeCoNi(CuAl)_(0.8)high-entropy alloy

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Journal of Rare Earths 2023年第10期41卷 1562-1567,I0004页

作者： Jiaxin Zhu Mengxin Lv Chang Liu xiaohua tan Hui Xu Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The correlation between the microstructure and soft magnetic properties under the direct current(DC)mode of dual-phase FeCoNi(CuAl)_(0.8)RE_(0.05)(RE=Nd,Y)high-entropy alloys(HEAs)was *** diffraction(XRD)and electron backscattered diffraction(EBSD)results show that all samples consist of face-centered cubic(FCC)and body-centered cubic(BCC)*** comparison to the volume fraction of BCC phase of the RE-free HEA(25.3%),Nd and Y additions dramatically increase it to 42.0%and 43.3%,which leads to an increase of the saturation *** addition reduces the average grain size from 7.26 wm of the RE-free HEA to 5.42μm of RE=Nd HEA and 4.88μm of RE=Y *** magnetic domain structure is observed in both FCC and BCC phases in the RE-free and RE-containing *** additives of Nd and Y both decrease the stripe pattern width in FCC and BCC *** refined structure and finely spaced stripe domain by RE addition can decrease the *** with the RE-free HEA,RE addition can effectively enhance the DC soft magnetic property by decreasing the remanence,the coercivity,and the hysteresis loss.

关键词： Dual-phase high-entropy alloy Rare earths Soft magnetic property Stripe domain structure

EXPERIMENTAL ANALYSIS ON SOFT MATERIAL CONTACT PROBLEMS BY DIGITAL MOIR AND EMBEDDED-GRATING METHODS

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Acta Mechanica Solida Sinica 2015年第3期28卷 252-261页

作者： xiaohua tan Wei Qiu Yilan Kang Donghui Fu Xiaolei Li Xia Xiao Tianjin Key Laboratory of Modern Engineering Mechanics Tianjin University School of Mechanical Engineering Hebei University of Technology

Soft material is becoming increasingly important to many industries, which leads to the demand for a better understanding of its mechanical properties under large deformation. In this paper, a technique of integrating the digital moire method and embedded-grating approach is presented for investigating mechanical behaviors of a vulcanized silicone rubber in contact with a wedge-shaped indenter. Two distinct deformation sectors are observed from the experimental result. A simple way of computing strain is also presented by analysing grid deformation within the framework of geometrical nonlinearity. Three regions were observed from strain distribution along the horizontal direction： the contact region, the sink-in region and the far-field region. Moreover, the extent of the sticky region and that of the slippy region within the contact interface are distinguished, which can provide realistic data for theoretical modelling. Based on the finite deformation elasticity theory, the distribution of contact pressure and shear stress over the contact interface are derived for prediction of possible cracks.

关键词： soft material contact mechanics finite strain theory digital moird embeddedgrating

Enhanced magnetic properties of Ce_(17)Fe_(76.5)Co_1Zr_(0.5)B_6 alloys by magnetic field heat treatment

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Journal of Rare Earths 2023年第9期41卷 1360-1366,I0003页

作者： Yong Yang Bin Li Mengya Chen Zhongyuan Wu Ruiyi Zheng xiaohua tan Hui Xu Institute of Materials Science School of Materials Science and EngineeringShanghai UniversityShanghai 200072China

In the present work,Ce_(17)Fe_(76.5)Co_1Zr_(0.5)B_6 ribbons were prepared by a direct melt spinning *** effects of chamber pressure and magnetic field annealing temperature on the magnetic properties and microstructures of the alloys were *** grain size and content of Ce_(2)Fe_(14)B phase can be changed by adjusting the chamber pressure,and the optimal magnetic performance is obtained at0.04 *** magnetic properties can be influenced under magnetic field heat *** the annealing temperature is lower than the Curie temperature,the refinement and a uniform distribution of the grains is *** irreversible magnetic susceptibility curve reveals that magnetic field heat treatment enhances the exchange coupling interaction between grains of the Ce_(2)Fe_(14)B *** the magnetic field annealing temperature is 438 K,the alloy displays the optimal magnetic *** with the as-spun sample,the values of intrinsic coercivity(H_(ci)),remanence(B_r) and maximum energy product((BH)max) increase by 3.4%,9.8% and 18.7%,*** work provides an effective approach by which to enhance the magnetic properties of Ce-Fe-B alloys.

关键词： Ce-Fe-B Magnetic properties Microstructure Magnetic field heat treatment Rare earths

Abnormal mechanochemical effect in ultraprecision machining of an additively manufactured precipitation-strengthened high-entropy alloy

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Journal of Materials Science & Technology 2024年第3期170卷 221-237页

作者： Long Xu Yuchao Bai Yunfa Guo Chang Ren xiaohua tan Yandong Jia Gang Wang Hao Wang Institute of Materials Shanghai UniversityShanghai 200444China Zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314100China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

Recently,researchers have explored the use of precipitation strengthening and finer microstructures with high-density dislocations in additive manufacturing to produce high-entropy alloys(HEAs)with adjustable ***,the inherent surface roughness and lack of machinability research in AMed HEAs limit their engineering *** this study,we systematically investigated the microstructural characteristics,mechanical properties,and machinability of Fe_(29.3)Co_(28.7)Ni_(28.6)Al_(6.8)Ti_(6.6)(at.%)HEAs with three different structures:single FCC phase cellular(SPC),dual precipitation-strengthened(DPS),and single precipitation-strengthened(SPS).These structures were fabricated by selective laser melting and isothermally annealing at 780 and 940℃.Compared to SPC HEA,DPS HEA exhibits a significant increase in yield strength and ultimate tensile strength but with a dramatic sacrifice in *** HEA exhibits similar mechanical properties to SPC HEA due to the pronounced coarsening of L21 *** ultraprecision machining micro-cutting test showed that SPC HEA had a significant mechanochem-ical effect,as evidenced by a sharp drop in cutting force for inked workpieces,but not DPS *** abnormal finding was that the negligible reflection of cutting force for SPS HEAs suggested a negative mechanochemical effect,even though SPS HEA had equally excellent plasticity like SPC *** was found that nanocrystallization-induced strength enhancement and ductility reduction of SPS HEA lead to chips’deformation dominated by shear avalanche rather than chip folding of SPC HEA,which involves the reduction of surface energy and friction of chips’***,these results and our research findings may guide the machining of AMed precipitation-strengthened HEAs and accelerate their engineering ap-plication.

关键词： High-entropy alloy Selective laser melting Precipitation strengthening Machinability Mechanochemical effect

Dual precipitate simultaneous enhancement of tensile and fatigue strength in(FeCoNi)_(86)Al_(7)Ti_(7) high-entropy alloy fabricated using selective laser melting

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Journal of Materials Science & Technology 2023年第17期148卷 90-104页

作者： Long Xu Yandong Jia Zhenhui Wang Shiwei Wu Yuefei Jia Chuan Geng Jianchao Peng xiaohua tan Gang Wang Institute of Materials Shanghai UniversityShanghai 200444China Zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314100China Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117575Singapore Laboratory for Microstructures Shanghai UniversityShanghai 200444China

Recent studies have indicated that precipitation-strengthened high-entropy alloys(HEAs)show superior mechanical performance and have been successfully fabricated by additive ***,the lack of fatigue and fracture research has limited the engineering applications of additive manufacturing *** work explored a dual precipitation-strengthened(FeCoNi)_(86)Al_(7)Ti_(7) HEA with excellent tensile and fatigue strength,prepared through selective laser melting and heat *** with the as-built samples,the tensile properties and fatigue endurance limit improved through aging by 48.7%and 30%,*** strengthening mechanism and enhanced fatigue performance were clarified in *** improvement in fatigue strength was attributed to the improved resistance of the L1_(2) and L2_(1) *** deformation,the dislocation shear coherent L1_(2) precipitates reduced slip band energy and inhibited slip band expansion,while the L2_(1) particles acted as obstructions for further slip band propagation,severely limiting the rapid formation and propagation of crack ***-situ TEM cyclic tensile-tensile testing also clarified the fatigue crack growth behavior,demonstrating that crack deflection due to L2_(1) precipitate obstruction slowed down the crack growth rate and efficiently promoted the closure of the microcrack *** work offers im plications for a new strategy to develop additive manufacturing HEAs.

关键词： High-entropy alloy Selective laser melting Precipitation strengthening Fatigue Crack deflection

Gene mutations and clinical phenotypes in Chinese children with Blau syndrome

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Science China(Life Sciences) 2017年第7期60卷 758-762页

作者： Caifeng Li Junmei Zhang Shipeng Li Tongxin Han Weiying Kuang Yifang Zhou Jianghong Deng xiaohua tan Department of Rheumatology and Immunology Beijing Children's Hospital Capital Medical University National Center for Children's Health Beijing 100045 China

The mutations of CARD15 gene and clinical features of Chinese patients with Blau syndrome were analyzed. We identified10 missense mutations, out of which five were new: R334 L, E383 D, R471 C, C495 R and D512 F. The rest of them, R334 W,R334Q, G481 D, M513 T and R587 C, have been reported previously. Among all the mutations, R334 W, R334 Q and C495 R had the highest frequency. Blau syndrome was found at early age after birth. It began with lepidic rash and symmetric polyarthritis and was phenotypically characterized by typical rash, arthritis, iridocyclitis and arteritis. Cardiac involvement was also found in Blau syndrome. In addition to nerve deafness, renal involvement, osteochondroma and central nervous system involvement were also found in our patients. Therefore, Chinese children with Blau syndrome have unique gene mutations and complicated clinical phenotypes. Pathologic examination and CARD15 mutation testing should be considered for diagnosis as early as possible for suspected patients.

关键词： Blau syndrome genetic mutation clinical phenotype

Gene mutations and clinical phenotypes in 15 Chinese children with cryopyrin-associated periodic syndrome(CAPS)

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Science China(Life Sciences) 2017年第12期60卷 1436-1444页

作者： Caifeng Li xiaohua tan Junmei Zhang Shipeng Li Wenxiu Mo Tongxin Han Weiying Kuang Yifang Zhou Jianghong Deng Department of Rheumatology and Immunology Beijing Children's HospitalCapital Medical UniversityNational Center for Children"s HealthBeijing 100045China

The aim of our study is to explore the features of clinical manifestations and genetic mutations in Chinese CAPS patients. Fifteen confirmed patients with CAPS were enrolled. The onset time ranges from 2 days after birth to 6 years and 1 month. Recurrent urticaria rash(93.3%) with fever(100%) were two dominant characteristics of these patients that were presented as either acute or chronic process. Systemic involvements were found in all patients except for one with only rash and fever. The top three symptoms were fever(100%), rash(93.3%) and myalgia(76%). Other clinical manifestations include arthritis(11 cases), lung involvement(seven cases), optical dysfunction(seven cases), nerve deafness(six cases), nervous system involvement(five cases), hepatomegaly, splenomegaly and lymphadenectasis(five cases). Also, four patients had heart involvement and one patient suffered kidney involvement. The laboratory inflammation index such as leukocyte counts, platelet counts, erythrocyte sedimentation rate(ESR), C-reactive protein(CRP), serum amyloid A(SAA) and fibrinogen(FIB) increased significantly at initial stage, but decreased after therapy. As for gene mutation detection, Twelve out of 15 patients were confirmed with mutation in NLRP3, including 11 mutant site: c1789 A>G, c.1703 T>A, c.913 G>A, c.1710 G>C, c.1057 G >T, c.2335 C>T, c.932 T>C,c.296 G>C, c.663 C>T, t.1702 T>A, 299 G>A. Mutation sites c.1703 T>A, c.2335 C>T, c.296 G>C, c.663 C>T, and 299 G>A were newly identified. The association between gene mutation and clinical manifestation shows that D305 N was highly associated with severe organs involvements, and therefore, the time of therapy and regimen were critical for the prognosis of disease. As the largest cohort study of Chinese CAPS patients, we confirmed that all patients presented typical clinical manifestations, identified five new mutation sites on NLRP3 and analyzed the correlation between the genotypes and phenotypes. We also raise concerns for one case

关键词： CAPS genetic mutation clinical phenotTpe NLRP3

Bilateral papilledema caused by chronic infantile neurological cutaneous and articular syndrome in a child with a novel (p. D305N) mutation in NLRP3 gene: a case report

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Annals of Eye Science 2021年第3期6卷 80-88页

作者： Li Li Huanfen Zhou Wei Shi Xiaotun Ren xiaohua tan Lirong Tian Chunxia Peng Department of Ophthalmology Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijingChina Department of Ophthalmology The First Medical Center of Chinese People’s Liberation Army General HospitalBeijingChina Department of Neurology Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijingChina Department of Rheumatology and Immunology Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijingChina

The rare disease of chronic infantile neurological cutaneous and articular(CINCA)syndrome,is caused by the over-secretion of interleukin(IL)-1βdue to a gain-of-function NLRP3 gene mutation in the autosomal chromosome which often involves in *** this report,we studied a 9-year-old girl with *** eyes were also involved and presented bilateral *** testing revealed that the symptoms were caused by a novel gene mutation site(c.913G>A,p.D305N)in conservative domain exon-3 of NLRP3 which is gain-function gene of *** patient had the characteristic facial features,frontal fossa and saddle nose,manifested the generalized urticaria-like skin rash at two weeks after birth,periodic fever 6 months after birth,sensorineural deafness at 7 years old,and bilateral papilledema,aseptic meningitis and knee arthropathy at 9 years *** cell counts,C-reactive protein increased and intracranial pressure raised to 300 *** meningeal thickening enhanced by gadolinium in magnetic resonance imaging(MRI).Based on clinical features and genetic test,the girl was diagnosed bilateral papilledema secondary to CINCA and administered prednisone and lowered intracranial pressure medicine to resolve *** 3-year follow-up,patient had no inflammatory flare-up with visual acuity *** finding of novel genetic mutation site(p.D305N)in NLRP3 gene expanded genotype spectrum associated with *** case also expanded the cause spectrum of papilledema and it highlighted systemic disease history for patients with bilateral papilledema.

关键词： Papilledema chronic infantile neurological cutaneous and articular syndrome(CINCA syndrome) novel genetic mutation site IL-1 blockage agent

Economy Analysis for Bijie District about the Twelfth Five-Year Plan-Fixed Assets Investment and Production Soaring Forecasting

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Economy Analysis for Bijie District about the Twelfth Five-Y...