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The evaluation of next-generation probiotics on broiler growth performance, gut morphology, gut microbiome, nutrient digestibility, in addition to enzyme production of Bacillus spp. in vitro

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ANIMAL NUTRITION 2024年第3期18卷 133-144页

作者： Bromfield, Jacoba I. Niknafs, Shahram Chen, Xiaojing von Hellens, Juhani Horyanto, Darwin sun, baode Yu, Lei Tran, Viet Hai Navarro, Marta Roura, Eugeni Bioproton Pty Ltd Brisbane Qld Australia Univ Queensland Ctr Nutr & Food Sci Queensland Alliance Agr & Food Innovat Brisbane Qld Australia Univ Queensland Ctr Anim Sci Queensland Alliance Agr & Food Innovat Brisbane Qld Australia

Considerable research has been conducted into the efficacy of individual probiotics in broiler production, however information on the most effective combinations of synergistic Bacillus probiotic is lacking. This study investigated the impact of different Bacillus strain combinations in broiler chickens, as well as in vitro enzyme production. In experiment one, a total of 576 Ross 308 broilers at 1 d old were grown for 21 d across 6 treatments of maize-soybean diets (n = 12 pens per treatment) to compare three different strain combinations (formulation 1 [F1]: 3 strains Bacillus amyloliquefaciens; F2: Bacillus coagulans and 2 strains B. amyloliquefaciens; F3: B. coagulans, Bacillus licheniformis and 2 strains B. amyloliquefaciens; F5: Bacillus subtilis, B. licheniformis and 2 strains B. amyloliquefaciens), positive control (PC), and a negative control antibiotic treatment group (NC). In Exp. 2, a total of 360 one-day-old ROSS308 broilers were used to test five treatments (n = 9) including PC, NC, F1 and F5 (selected from Exp. 1), and F4 (Bacillus pumilis and 2 strains B. amyloliquefaciens) in a maize-soybean diet. B. amyloliquefaciens F1 demonstrated a significant improvement in feed conversion ratio (FCR) compared to F2 at d 14 (1.49 vs 2.10; P = 0.038) and the body weight (BW) at d 21 (847.0 g vs 787.4 g) compared to other combinations (P = 0.027). The FCR at d 21 tended to be lower in birds fed F1 (1.46 vs 1.66) compared to the control (P = 0.068). Probiotic treatments had significantly improved nutrient digestibility compared to the PC and NC. Also, probiotic treatments supported the growth of Streptococcus, a common commensal genus and reduced the abundance of genera that correlated with low weight gain such as Akkermansia. Experiment two revealed that F4 improved FCR (P < 0.001) and BW at 28 d (P = 0.014). In vitro testing showed a high production of protease and amylase by Bacillus. Thus, the addition of Bacillus probiotics, particularly containing B. amyloli

关键词： Broiler Probiotic Bacillus Gut health Microbial profile LACTIC-ACID BACTERIA INTESTINAL MICROBIOTA GENE-EXPRESSION SUPPLEMENTATION SUBTILIS BARLEY DIETS

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静磁场辅助金属增材制造技术研究进展

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中国材料进展 2024年第4期43卷 311-322页

作者：杜大帆董安平祝国梁雷力明孙宝德上海交通大学材料科学与工程学院上海市先进高温材料及其精密成形重点实验室上海200240 中国航发上海商用航空发动机制造有限责任公司上海201306

增材制造作为一种新型的材料加工技术,具有制造周期短、材料利用率高和可制备结构复杂零件等优势,可以为定制形状复杂的产品开辟新途径,目前该技术在装备、材料、工艺、标准等方面都呈现迅猛发展之势,尤其在航空航天等高端制造领域展示... 详细信息

增材制造作为一种新型的材料加工技术,具有制造周期短、材料利用率高和可制备结构复杂零件等优势,可以为定制形状复杂的产品开辟新途径,目前该技术在装备、材料、工艺、标准等方面都呈现迅猛发展之势,尤其在航空航天等高端制造领域展示出了极大的应用前景。然而,对增材制造金属材料的组织、缺陷演化机理尚不明确,极大地制约了增材制造技术的大规模应用。外加物理能场作为外界辅助手段可以直接对金属材料制备过程的物理变化和化学反应过程产生影响,因而被用来控制其变化或反应过程。在金属增材制造过程施加外部磁场,可以影响其微熔池冶金过程、微观组织和力学性能。介绍了静磁场对金属凝固过程的影响的基本效应,并着重介绍了静磁场对3种具有代表性的增材制造方法,即:激光定向能量沉积、粉末床激光熔融和电弧送丝增材制造方法的成形过程、组织和性能的影响机制,从材料、方法和应用的角度综述了静磁场辅助下金属增材制造领域的研究进展。此外,指出了静磁场辅助金属增材制造技术面对的挑战,并讨论了未来发展趋势。

关键词：金属材料增材制造静磁场组织力学性能

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熔模铸件尺寸控制的数字孪生建模关键技术与应用

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金属学报 2024年第4期60卷 548-558页

作者：官邦汪东红马洪波疏达丁正一崔加裕孙宝德上海交通大学材料科学与工程学院上海市先进高温材料及其精密成形重点实验室上海200240 上海交通大学金属基复合材料国家重点实验室上海200240 西安电子科技大学机电工程学院西安710126

熔模铸造工艺流程长、工序多,铸件成型过程孤岛控制,存在尺寸超差问题。本工作基于节点法向量和最近邻点,提出熔模铸造工艺全节点位移传递的计算方法,解决熔模铸件成型多流程的数据孤岛问题。研究蜡模注射成型和铸件凝固过程工艺参数-... 详细信息

熔模铸造工艺流程长、工序多,铸件成型过程孤岛控制,存在尺寸超差问题。本工作基于节点法向量和最近邻点,提出熔模铸造工艺全节点位移传递的计算方法,解决熔模铸件成型多流程的数据孤岛问题。研究蜡模注射成型和铸件凝固过程工艺参数-尺寸偏差的关系,为数字孪生建模提供数据模型。对环套环特征件建立铸件模具反变形设计和铸件多流程下工艺优化的数字孪生应用。该数字孪生模型应用于设计阶段,反变形设计出模具内腔的三维几何模型。模拟结果表明,铸件所有节点位移偏差在0.04 mm以下。应用于流程之间的工艺控制,根据前一工序下尺寸偏差,进行后续工艺优化调控。

关键词：熔模铸造尺寸传递反变形设计数字孪生智能铸造

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镍基高温合金反重力铸造压力曲线设计与验证

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航空材料学报 2024年第2期44卷 143-150页

作者：隋大山麻晋源许圆王迪董安平孙宝德上海交通大学材料科学与工程学院塑性成形技术与装备研究院上海200030 上海工程技术大学材料科学与工程学院上海201620 上海交通大学材料科学与工程学院上海市先进高温材料与精密成形重点实验室上海200240

针对镍基高温合金反重力铸造工艺中传统压力曲线设计方法的不足,充分考虑铸件沿充型方向的变截面结构特征,通过CAD软件的二次开发,实现铸件截面积的自动计算,以定量化描述铸件的截面变化特征。基于伯努利方程和流量守恒方程,推导出充型... 详细信息

针对镍基高温合金反重力铸造工艺中传统压力曲线设计方法的不足,充分考虑铸件沿充型方向的变截面结构特征,通过CAD软件的二次开发,实现铸件截面积的自动计算,以定量化描述铸件的截面变化特征。基于伯努利方程和流量守恒方程,推导出充型压力与金属液面上升速度之间的关系,提出基于铸件截面积自动计算的新型压力曲线设计方法。在此基础上,对镍基高温合金铸件的反重力铸造过程进行数值分析。充型模拟结果表明:与传统压力曲线设计方法相比,新型设计方法确定的压力曲线能使最小截面处充型速度峰值由0.611 m/s降至0.439 m/s,降幅达28.15%,有效避免金属液震荡和飞溅;同时可缩短充型时间,确保金属液快速平稳充型。水力学实验和浇注实验表明,新型压力曲线的充型液面更平稳,能有效抑制铸造缺陷,证明新型压力曲线设计方法的有效性,为合理设计反重力压力曲线提供依据。

关键词：镍基高温合金反重力铸造压力曲线变截面数值模拟

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Atomic scale visualizations of low-angle grain boundary mediated plasticity by coupled dislocation climb and glide in nanoporous gold

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Nano Research 2023年第2期16卷 2622-2629页

作者： Shufen Chu Junnan Jiang Xiaoran Zhao baode sun Pan Liu Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming State Key Laboratory of Metal Matrix CompositesSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Grain boundaries(GBs),as a prevalent structural characteristic,play a crucial role in the deformation of nanoporous metals with nanosized grains and ***,the fundamental understanding of GB-mediated deformation is still lacking because the plastic behavior of discrete ligaments involving GBs remains to be ***,we report atomic scale visualizations of coupled GB dislocation climb and glide in nanoporous gold ligaments with low-angle GBs via in situ tensile straining inside a Cs-corrected transmission electron *** zig-zag motion paths of GB dislocations are precisely determined by real-time tracking of the movements of dislocation *** concurrent climb and glide of the dislocation arrays are confined to a narrow GB region,greatly enhancing GB diffusion in the bicrystal *** findings of coupled dislocation climb and glide shine a light on the room-temperature deformation of nanoporous metals and provide a time-dependent atomic-level physical image for GB engineering.

关键词： nanoporous gold dislocation climb dislocation glide low-angle grain boundaries

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Effects of a high magnetic field on single-phase interface evolution,additional interfacial energy and nucleation undercooling in Al-based alloy

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Journal of Materials Science & Technology 2023年第23期154卷 43-53页

作者： Lin Wang Zhipeng Long Long Hou Song Yan baode sun Xi Li Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Advanced Special Steels Shanghai University Shanghai 200072 China

The effects of a high magnetic field on the evolution of the single-phase interface and the liquid-solid interface energy in Al-Cu alloy were investigated *** is found that the application of the magnetic field has a significant promotion effect on the migration of liquid droplets,accelerating the formation of the single-phase *** should be attributed to the thermoelectric(TE)magnetic convection in the droplets which has enhanced the diffusion and increased the migration speed of liquid ***,the effect of the high magnetic field on the solid-liquid interface energy is analyzed by an improved grain boundary groove(GBG)*** average solid-liquid interface energy of theα-Al/Al-Cu and Al2Cu/Al-Cu systems increases and decreases with the increase of the magnetic field,*** above experiment results are well explained based on the formation and interaction of the magnetic dipole at the solid-liquid ***,experimental results reveal that the magnetic-field-induced interface energy increases and decreases the nucleation undercooling of the Al-30wt.%Cu alloy and Al-35wt.%Cu alloy,*** studying the effect of the magnetic-field-induced interface energy on the nucleation undercooling,the understanding of the interface energy-induced nucleation undercooling deepens.

关键词： High magnetic field Interface energy Nucleation undercooling Grain boundary groove

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Revisiting intrinsic brittleness and deformation behavior of B2 NiAl intermetallic compound: A first-principles study

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Journal of Materials Science & Technology 2018年第4期34卷 620-626页

作者： Hui Xing Anping Dong Jian Huang Jiao Zhang baode sun Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong University State Key Laboratory of Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration Shanghai Jiao Tong University State Key Lab of Metal Matrix Composites Shanghai Jiao Tong University

For NiAI intermetallic compound with B2 structure, there is still no calculation combining models of sin- gle and multiple layers while using the same basic set. Furthermore, some recently proposed criteria for brittleness and toughness have not been used to analyze its deformation behavior. Thus, first-principles calculation was applied to comprehensively study the elastic properties, ideal strength, generalized stacking fault energy and surface energy of B2-NiA1 intermetallic compound. The results suggest that calculations based on the current basic set give more accurate lattice parameters and elastic moduli. The Pugh criterion and Cauchy pressure cannot be used to interpret the intrinsic brittleness of NiAI. In comparison, the ductility parameter based on the strain energy under elastic instability and ZCT and Rice criteria based on generalized stacking fault energy and surface energy successfully identify the intrinsic brittleness of the NiA1 intermetallic compound. The reason why [111] slip always occurs in the defor- mation along [100] direction was clarified by examining the critical value for brittle-ductile transition. The results of density of state indicate shear deformation has less impact on structural stability, and the change of charge density difference implies that 〈001〉 shear induces more intensive redistribution of charge density, which is well correlated to the brittleness and deformation behavior of NiAI intermetallic comnound.

关键词： Intermetallics Mechanical properties Computer simulation

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Deposition of Ti(C, N)-TiB_2 Composite Coating by Reactive LPPS

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稀有金属材料与工程 2009年第A3期38卷 129-133页

作者： Mao Zhengping Ma Jing Wang Jun sun baode State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University Shanghai 200240 China Hebei University of Science and Technology Shijiazhuang 050054 China

Ti(C, N)-TiB2 composite coatings were deposited by means of reactive low pressure plasma spraying (LPPS) based on the technology of self-propagating high-temperature synthesis (SHS). The original powders were mixtures of Ti and B4C powders. The powders were mixed by ball mill and then spray-dried and at last sintered to be suitable for spraying. Two spraying distances were selected for LPPS. Scanning electron microscopy (SEM) was used to investigate the morphologies of powders for spraying and the microstructures of the coatings. The phase compositions of coatings were measured by X-ray diffraction (XRD). Spray-dried and sintered powders are denser and better bond than only spray-dried powders. The composite coating is composed of TiB2, TiC0.3N0.7, TiN0.3, Ti4N3-x and impurity phase of Ti5Si3 with 300 mm spraying distance. Partly unreacted B4C powders remained in the coating for 240 mm spraying distance, which may be inadequate reaction. No titanium oxide was detected in the composite coating for the relative high vacuum degree of LPPS. The anti-corrosion property of LPPS sprayed Ti(C, N)-TiB2 composite coating with 300 mm spraying distance in electrolytic solution is superior to that of 240 mm spraying distance. Microhardness of Ti(C, N)-TiB2 composite coating is relatively low due to the unconsolidated structure of the coating. The solving methods to improve property of composite coating are finally put forward in the paper.

关键词：复合涂层复合材料物理性能烧结密度

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Relationship of particle stimulated nucleation,recrystallization and mechanical properties responding to Fe and Si contents in hot-extruded 7055 aluminum alloys

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Journal of Materials Science & Technology 2019年第11期35卷 2570-2581页

作者： Huan She Da Shu Anping Dong Jun Wang baode sun Hongchang Lai Department of Implant Dentistry Shanghai Ninth People's HospitalCollege of StomatologyShanghai Jiao Tong University School of MedicineShanghai 200011China Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

The variations of coarse intermetallic particles in hot-extruded 7055 aluminum alloys with 0.041 wt%Fe and 0.024 wt%Si increasing to 0.272 wt%Fe and 0.134 wt%Si were *** particle stimulated nucleation(PSN)behaviors for different kind of coarse particles were detailly analyzed by ***,the effect of PSN responding to Fe and Si contents on recrystallization and tensile properties of 7055 alloys was *** increasing Fe and Si contents,the size and number density of coarseη/S particles are reduced,while the number densities of coarse Al7Cu2 Fe and Mg2Si particles are both increased and the coarse Al7Cu2 Fe particles transform from rod-like to *** PSN recrystallized grains with predominant orientations deviated from the extruded fiber textures are stimulated by the irregular Al7Cu2 Fe and Mg2Si particles,because a higher degree of local non-uniform deformation is *** rod-like Al7Cu2 Fe particles cause the greatest degree of local non-uniform deformation owing to the largest aspect ratio,but the shape also restricts the area of particle deformation zone(PDZ)resulting in fewer PSN recrystallized *** irregularη/S particles give rise to the lowest degree of local non-uniform deformation and fewest PSN recrystallized grains with the major orientations close to the extruded fiber ***,despite the number and size of coarseη/S particles are reduced,the proportion of high angle grain boundaries(HAGBs)is increased and the extruded fiber textures are weakened with Fe and Si contents increasing,because of the increased Al7Cu2 Fe and Mg2Si *** strength is slightly declined by the weakened//ED(extrusion direction)fiber texture,while the elongation is reduced for a larger number of coarse particles and more HAGBs with higher Fe and Si contents.

关键词： 7055 aluminum alloy Particles Recrystallization Texture Mechanical properties

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Effects of V addition on the mechanical properties at elevated temperatures in a γ”-strengthened NiCoCr-based multi-component alloy

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Journal of Materials Science & Technology 2022年第12期107卷 290-300页

作者： Yunwei Pan Anping Dong Yang Zhou Dafan Du Donghong Wang Guoliang Zhu baode sun Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

Ni Co Cr-based multi-component alloys have drawn much attention due to their exceptional ductility and strain hardening ***,insufficient strength-ductility synergy of NiCoCr alloy has always been an issue that prevents it from extensive *** to our previous research,the precipitation ofγ”phase can significantly improve the strength-ductility synergy of this alloy system at room *** this study,the effects of V addition onγ”phase stability and high-temperature mechanical properties have been explicitly *** results indicate that V addition can stabilize the metastableγ”phase in this alloy system and prevent it from transforming into a stableδphase at grain boundaries upon 650℃aging,resulting in improved mechanical properties at elevated *** specific strength ofγ”-strengthened multi-component NiCoCr-based alloy can reach up to 86.2 MPa gcmat 650℃,which is higher than those of Ni-based superalloys,IN 939 and *** work provides theoretical guidance for the novel design of γ”-strengthened alloy for high-temperature applications.

关键词： Multi-component alloys CALPHAD γ”phase Microstructural evolution High-temperature mechanical properties

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