Results 21 to 30 of about 151,631 (166)
Dizhen xuebao, 2023 利用2008—2021年区域地震台网及部分流动地震台阵的近震走时观测资料，采用双差层析成像方法获得了龙门山断裂带和安宁河断裂带周边地区的高分辨率地壳三维P波速度结构。结果显示：四川盆地浅部呈明显的低速异常，在前陆盆地低速异常可一直延伸至约15 km深，推测与该地区接收大量来自青藏高原东缘的沉积物有关；在龙门山断裂带附近，中上地壳存在一些与断裂带平行的高速异常体，它们较好地揭示了该地区穹隆体和逆冲推覆体深浅部的分布特征，例如，位于龙门山断裂带中部的彭灌穹隆体下延深度可达15 km左右 ...
Yuchen Xiao, Jianping Wu
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Bio‐Inspired Damage‐Tolerant Si‐Based Anode for Lithium‐Ion Batteries
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Silicon is a promising anode material for lithium‐ion batteries due to its high specific capacity, but it suffers from large volume change and rapid brittle fracture during the lithiation/delithiation cycling process. Although the majority of the literature work has tried to avoid fracture by restraining volume expansion or relieving expansion
Jiali Tong +11 more
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Gaoya dianqi, 2021 针对一起500 kV断路器爆破片破裂事故,通过对破裂爆破片开展理化检验,发现故障爆破片材质为灰铸铁,表面有微孔,双侧用橡胶层密封保护,没有锈蚀,电镜分析表明材料脆性较大。通过更换同型断路器爆破片,比较新旧爆破片的性能,发现旧爆破片均有变形,大部分旧爆破片外侧橡胶层老化龟裂,导致爆破片进水锈蚀。通过开展爆破试验,发现部分旧爆破片爆破压力降低,但并不是锈蚀严重的样品。结果表明锈蚀并不是导致爆破片爆破压力下降的关键原因,该爆破片为平板型,铸铁材质,脆性较大,抗疲劳性能不足 ...
焦宗寒, 郑欣, 马宏明, 宋玉锋
doaj
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Carbides strengthen the grain boundaries; nevertheless, excessive carbide precipitates embrittle the grain boundaries of high‐temperature alloys during prolonged service. Here, we provide direct evidence of solute rare‐earth atoms and demonstrate that they can trap vacancies and inhibit interstitial diffusion, restraining carbide precipitation
Jiali Zhang +10 more
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, 1979 本文用三点弯曲和四点弯曲试样,在K_Ⅱ/K_Ⅰ=0—14的范围内,对GC-4超高强度钢、30Cr2MoV中强度转子钢和稀土球墨铸铁进行了线弹性平面应变复合型脆断试验。结果表明:复合型裂纹的脆断开裂方向与现有的三种复合型理论符合较好;但是,复合型裂纹扩展阻力随K_Ⅱ/K_Ⅰ比值增加而增大,与现有复合型理论差别较大。本文从塑性区的形状、大小和裂纹顶端在开裂方向的应力状态等方面对此问题进行了分析并指出,现有理论关于复合型裂纹扩展阻力与变形特征无关的假设,对于具有一定塑性变形能力的金属材料,是不合适的 ...
杨成寿, 王自强, 高桦, 周爱华
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Gaoya dianqi, 2021 复合绝缘子断串及芯棒击穿事故会对输电线路的安全稳定运行构成严重的威胁。文中对2016年以来浙江省内发生的复合绝缘子断串及芯棒击穿故障案例进行统计分析,包括故障概况、产品情况、故障形态、性能试验、故障原因以及相关建议措施等。结果表明,2016年以来浙江省内共发生8起复合绝缘子断串及芯棒击穿故障,包括6起酥朽断裂、1起脆性断裂及1起芯棒击穿。其中,脆性断裂主要为端部密封不良,外部潮气进入,并在长期高场强作用下产生的应力腐蚀所致;酥朽断裂主要为芯棒—护套粘接不良,在受潮、放电 ...
周晨 +5 more
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Simulating hydrogen embrittlement fracture based on phase field method
Xibei Gongye Daxue Xuebao, 2022 The phase field hydrogen embrittlement fracture model is improved by introducing tension-compression split of strain energy. The numerical formulas of the model are provided, besides, the coupling term of concentration field and displacement field is ...
CHEN Pengcheng +3 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Bimetallic structures fabricated by laser powder bed fusion (LPBF) provide an effective strategy for achieving multifunctional integration, yet interfacial structural continuity and the role of lattice defects remain insufficiently understood.
Jinguo Ge, Shuo Yin
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT An ultra‐high as‐deposited tensile strength of 1408 MPa—the highest reported value for laser‐directed energy deposition (L‐DED) fabricated Ti2AlNb alloy—is achieved in this study. The as‐deposited microstructure consists of coarse B2 grains with a high density of fine acicular O phase precipitates within the grains, along with a brittle α2 ...
Ximiao He +7 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The inherent brittleness of hardmetals stems from the rigid covalent bond in the ceramic matrix and the sharp ceramic/metal interface, which restricts the nucleation and motion of dislocations. In this study, a novel strategy is proposed to activate significant dislocation behaviors in the WC matrix by employing a non‐equiatomic CoNiFeCr ...
Cheng Qian +9 more
wiley +1 more source