Results 21 to 30 of about 274,262 (149)
Teshugang, 2021 铸坯高中心等轴晶率及小的二次枝晶臂间距有利于降低高碳钢M+E-EMS连铸坯中心偏析。通过建立GCr15钢220 mm×260 mm连铸坯耦合有限元-元胞自动机模型(CAFE)及二次枝晶臂间距(SDAS)模型,研究结晶器电磁搅拌、过热度和拉速对中心等轴晶率及二次枝晶臂间距的影响。结果表明,相比于拉速,过热度和结晶器电磁搅拌对其影响明显。随着过热度降低及结晶器电磁搅拌强度增加,铸坯中心等轴晶率增加而二次枝晶臂间距减小,而拉速对凝固终点和中心固相率影响大。工业试验结果表明,采用结晶器与凝固末端电磁搅拌 ...
左欢, 杨祝英, 安航航
doaj
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Laser powder bed fusion (LPBF) enables the fabrication of complex superalloy microlattice metamaterials, but internal defects and micro‐segregation severely impair their performance. While conventional hot isostatic pressing (HIP) is widely used for volumetric defect closure, maintaining geometric fidelity remains challenging for fine‐featured
Jiayi Chen +12 more
wiley +1 more source
Zhongguo youzhi, 2023 为探究硬脂烷醇（SA）和米糠蜡（RW）在油凝胶中的相互作用机制，以不同配比的SA和RW为凝胶剂制备了葵花籽油凝胶，采用差示扫描量热仪（DSC）、低场核磁共振仪和偏光显微镜（PLM）探究不同SA与RW配比对油凝胶热性质、微观结构形态和结晶行为的影响。结果发现：不同油凝胶的固体脂肪含量（SFC）随温度的升高出现二次降低现象；随着SA和RW配比的变化，SA和RW在体系中按熔点高低顺序结晶，在结晶过程中出现共晶现象；RW油凝胶的晶体为棒状或针状结构，SA油凝胶的晶体为片状结构，当SA在凝胶剂中占比增加时 ...
武永恒，杨国龙，孟鹏程，刘伟 WU Yongheng, YANG Guolong, MENG Pengcheng, LIU Wei
doaj +1 more source
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT To address the insufficient wear resistance of high‐entropy alloy (HEA) coatings under extreme conditions, FeCoNiCrCu and FeCoNiCrCuB0.03Si0.03 microalloyed coatings were fabricated via annular oscillating laser deposition. This work systematically investigated the effects of synergistic B/Si addition on their phase composition, microstructure,
Tao Wang +6 more
wiley +1 more source
四川大学学报. 自然科学版, 2007 采用差示扫描热量仪(DSC),通过非等温结晶方法研究了全芳及半芳族热致性液晶(TLCP)对聚苯硫醚(PPS)结晶行为的影响,并通过偏光显微镜(PLM)分析了结晶过程中的微观结构.研究表明,加入少量全芳或半芳族TLCP,可显著提高PPS最大结晶温度和结晶速率,全芳族TLCP起异向成核作用,而半芳族TLCP促进晶体增长.
张冠星 +4 more
doaj
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Defect engineering plays a crucial role in regulating the active sites and reaction pathways of nanozymes. In this work, oxygen vacancies (Vo) were successfully introduced and stably regulated in ternary CoFeMo layered double hydroxide (CFM LDHs) via a microwave‐assisted hydrothermal strategy, leading to the construction of oxygen‐vacancy‐rich
Min An +8 more
wiley +1 more source
Gongye shui chuli, 2000 用加晶种于过饱和溶液中的方法测定了CaCO3晶体结晶生长的动力学过程,得到了不加阻垢剂及加阻垢剂两种条件下的结晶生长反应速率常数。结果表明,PBTCA及同济大学测试中心研制的丙烯酸马来酸共聚物(AA—MA)能明显地阻止溶液中CaCO3在晶种表面的结晶生长,研究发现,阻垢的机理主要是阻垢剂对CaCO3晶种表面具有吸附作用,从而抑制了CaCO3的结晶生长,这种吸附作用符合Langmuir等温吸附特征,并且CaCO3晶体对PBTCA的吸附属于单分子化学吸附,PBTCA吸附于微晶表面的活性增长点。
朱志良 +3 more
doaj +2 more sources
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT This study systematically investigates the creep behavior of an Al19Co21Fe20Ni40 eutectic high‐entropy alloy (EHEA) at 500°C, focusing on the synergistic effects of heterostructure design and trace boron doping. Thermomechanical processing was employed to produce a heterostructure consisting of alternating lamellar and equiaxed regions.
Xudong Liu +7 more
wiley +1 more source
四川大学学报. 自然科学版, 1997 报道了白蜡虫马氏管胞内细胞质的绝大部分为两种矿质（尿酸结晶）所占据．一种为不规则状结晶，占结晶总量的７０％，大小不一，含有尿酸及Ｓｉ，Ｐ，Ｃｌ，Ｆｅ，Ｃｕ，Ｚｎ和Ｓ等矿质元素．另一种为年轮状结晶，占结晶总量的３０％，其体积较大，含尿酸及Ｃｌ，Ｃａ，Ａｌ和Ｃｕ等矿质元素，起源于线粒体．结晶颗粒不排入管腔．因胞内存在大量结晶致使白蜡虫马氏管形成以贮存排泄为主，溶质 ...
徐天瑞, 刘晨光, 吴次彬
doaj
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT The rapid advancement of power electronics has created an urgent demand for high‐permeability, low‐loss soft magnetic materials to unlock the full potential of wide‐bandgap semiconductors and improve the efficiency of switching‐mode power supplies.
Wenbo Xiang +10 more
wiley +1 more source