Scripta Materialia最新文献_第2页

Enhancing the conductivity and crystallinity of (111) platinum films via a two-temperature deposition and substrate annealing 通过双温沉积和基底退火提高 (111) 铂薄膜的导电性和结晶度

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-11-05 DOI: 10.1016/j.scriptamat.2024.116442

Marshall B. Frye , Jonathan R. Chin , Matthew Barone , Steven E. Zeltmann , Lauren M. Garten

引用次数: 0

Si segregation deters prenucleation at the interfaces between liquid-aluminum and TiB2 substrates, the origin of ‘Si poisoning’ 硅偏析阻止了液态铝基底和 TiB2 基底界面上的预核，这是 "硅中毒 "的起源

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-11-04 DOI: 10.1016/j.scriptamat.2024.116445

Changming Fang, Yun Wang, Zhongyun Fan

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Achieving dislocation-precipitation strengthening synergy in additively manufactured medium-entropy alloy via cyclic deep cryogenic strategy 通过循环深冷策略实现添加式制造中熵合金的位错-沉淀强化协同作用

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-11-01 DOI: 10.1016/j.scriptamat.2024.116441

Bo Liu , Dong Han , Tianrun Li , Jingping Cui , Ziwei Zhang , Guofeng Han , Xiaoming Wang , Baijun Yang , Jianqiang Wang

{"title":"Achieving dislocation-precipitation strengthening synergy in additively manufactured medium-entropy alloy via cyclic deep cryogenic strategy","authors":"Bo Liu , Dong Han , Tianrun Li , Jingping Cui , Ziwei Zhang , Guofeng Han , Xiaoming Wang , Baijun Yang , Jianqiang Wang","doi":"10.1016/j.scriptamat.2024.116441","DOIUrl":"10.1016/j.scriptamat.2024.116441","url":null,"abstract":"<div><div>A problem has recently been highlighted in the additively manufactured (AMed) L1<sub>2</sub>-strengthened high/medium-entropy alloys (H/MEAs), where the dislocation strengthening effect will be severely weakened due to the inevitable dislocation recovery that occurs during the aging process. To address this, a cyclic deep cryogenic strategy (CDCS) towards the dislocation-precipitation strengthening synergy is proposed. Besides dislocations, this strategy can introduce dense intersecting stacking faults, thus effectively enhancing the thermal stability of dislocations during aging due to the pinning effect of Lomer-Cottrell locking. The existence of these high-density defects further ensures the uniform precipitation of L1<sub>2</sub> phase. Significantly, the CDCS causes a substantial ⁓ 40% increase in the yield strength of the (CoCrNi)<sub>94</sub>Al<sub>3</sub>Ti<sub>3</sub> MEA sample without compromising the ductility, in which the contribution of dislocation strengthening is doubled. This work provides a pathway for obtaining high-performance AMed H/MEAs, especially L1<sub>2</sub>-strengthened H/MEAs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116441"},"PeriodicalIF":5.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the growth mechanism of Pt nanoparticles in oxides: Role of metal-oxide interactions 氧化物中铂纳米粒子的生长机制研究：金属-氧化物相互作用的作用

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-11-01 DOI: 10.1016/j.scriptamat.2024.116436

Panmei Liu, Shuo Ma, Zetao Mou, Yongchang Liu, Zumin Wang

{"title":"Study on the growth mechanism of Pt nanoparticles in oxides: Role of metal-oxide interactions","authors":"Panmei Liu, Shuo Ma, Zetao Mou, Yongchang Liu, Zumin Wang","doi":"10.1016/j.scriptamat.2024.116436","DOIUrl":"10.1016/j.scriptamat.2024.116436","url":null,"abstract":"<div><div>Strong interactions of metal nanoparticles (NPs) with oxide matrices can dramatically enhance the thermal stability of metal NPs. However, how metal-oxide interactions control the growth of metal NPs remains unclear. Here, the growth of Pt NPs with respect to metal-oxide interactions was investigated by encapsulating them in different Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> oxides. Pt NPs encapsulated in Al<sub>2</sub>O<sub>3</sub> exhibited excellent thermal stability than those in SiO<sub>2</sub>. Quantitative thermodynamic calculations revealed that metal-oxide interactions strongly governed the driving force for the coalescence of Pt in Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub>. The kinetic analysis further showed that stronger Pt-Al<sub>2</sub>O<sub>3</sub> interactions controlled the Ostwald ripening of Pt NPs by restricting the diffusion of Pt atoms in oxides, leading to a higher growth activation energy of Pt in Al<sub>2</sub>O<sub>3</sub> than SiO<sub>2</sub>. These findings explain the different sinter resistance of metal NPs when encapsulated in different oxides, providing valuable insights for enhancing the thermal stability of metal NPs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116436"},"PeriodicalIF":5.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controllable preparation of ultrafine bulk ODS W alloy with ultrahigh strength and improved ductility 可控制备具有超高强度和更好延展性的超细块状 ODS W 合金

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-11-01 DOI: 10.1016/j.scriptamat.2024.116439

Weiqiang Hu , Zhu Qian , ZuPeng Yan , Guizhen Shi , Xia Sun , Zongqing Ma , Yongchang Liu

{"title":"Controllable preparation of ultrafine bulk ODS W alloy with ultrahigh strength and improved ductility","authors":"Weiqiang Hu , Zhu Qian , ZuPeng Yan , Guizhen Shi , Xia Sun , Zongqing Ma , Yongchang Liu","doi":"10.1016/j.scriptamat.2024.116439","DOIUrl":"10.1016/j.scriptamat.2024.116439","url":null,"abstract":"<div><div>In order to alleviate the difficulties of coarse grains and poor mechanical properties in traditional hot worked bulk W alloys, we designed the entire chain preparation process including two-step freeze-drying, multi-step low temperature sintering and multi-step hot pressing. As a result, the hot worked bulk W-Y<sub>2</sub>O<sub>3</sub> alloy in this work features finest grain size (650 nm) and finer subgrains, ultrafine intergranular and intragranular oxide nanoparticles (<50 nm), novel oxide compositions (Y<sub>2</sub>WO<sub>6</sub> or Y<sub>2</sub>O<sub>3</sub>@Y<sub>2</sub>WO<sub>6</sub> core-shell phase), and specific W(110)/Y<sub>2</sub>WO<sub>6</sub> (232) (400), (432) or (<span><math><mrow><mover><mn>2</mn><mo>¯</mo></mover><mover><mn>2</mn><mo>¯</mo></mover></mrow></math></span>2) coherent phase interfaces. Furthermore, the above microstructure characteristics endow W-Y<sub>2</sub>O<sub>3</sub> alloy with highest strength (1401.0 MPa, 1284.4 MPa and 1039.1 MPa at 100 °C, 200 °C and 600 °C repectively), excellent ductility and outstanding structure thermal stability compare to traditional bulk ODS W alloy, which points out a new direction for the development of <em>ex-situ</em> precipitated second phase dispersion strengthened refractory metals.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116439"},"PeriodicalIF":5.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High speed impact induced dehydrogenation of titanium hydride and formation of cellular structure via cold spray 高速冲击诱导氢化钛脱氢及冷喷形成蜂窝状结构

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-11-01 DOI: 10.1016/j.scriptamat.2024.116443

Tao Chen , Pengfei Yu , Yusi Li , Yan Chen , Chao Yang , Rocco Lupoi , Shuo Yin , Xinyu Zhang

{"title":"High speed impact induced dehydrogenation of titanium hydride and formation of cellular structure via cold spray","authors":"Tao Chen , Pengfei Yu , Yusi Li , Yan Chen , Chao Yang , Rocco Lupoi , Shuo Yin , Xinyu Zhang","doi":"10.1016/j.scriptamat.2024.116443","DOIUrl":"10.1016/j.scriptamat.2024.116443","url":null,"abstract":"<div><div>In this study, it is revealed for the first time that ultra-high-speed impact can trigger in-situ dehydrogenation at the impact interface of titanium hydride (TiH). This phenomenon leads to a phase transformation from brittle TiH to ductile Ti, causing a shift in the ductile-to-brittle transition from the impact interface to the particle interior. Inspired by this unique behavior, and considering the mechanical interactions between particles during the spray process, TiH powders were used as feedstock to successfully produce a large-scale random cellular structure through cold spray. A systematic investigation of the deposition process revealed that unbroken TiH particles interact with dehydrogenated ones, resulting in only the ductile portion of the TiH particle being deposited, while the brittle interior is spalled off, consequently forming the “walls” of the cellular structures. This work highlights the potential of TiH powders to advance cold spray technology, particularly in the creation of complex cellular structures.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116443"},"PeriodicalIF":5.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correlations between local chemical fluctuations and grain boundary strength in Ti-Zr-Nb-Ta-Mo refractory multi-principal element alloys 钛-锆-铌-钽-钼多主元难熔合金中局部化学波动与晶界强度之间的相关性

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-10-31 DOI: 10.1016/j.scriptamat.2024.116438

Xiaoli Luo , Weiji Lai , Yuxi He , Xincheng Xu , Qihang Xu , Deqiang You , Sheng Cao , Wei Li , Xiaojian Wang

{"title":"Correlations between local chemical fluctuations and grain boundary strength in Ti-Zr-Nb-Ta-Mo refractory multi-principal element alloys","authors":"Xiaoli Luo , Weiji Lai , Yuxi He , Xincheng Xu , Qihang Xu , Deqiang You , Sheng Cao , Wei Li , Xiaojian Wang","doi":"10.1016/j.scriptamat.2024.116438","DOIUrl":"10.1016/j.scriptamat.2024.116438","url":null,"abstract":"<div><div>Ti-Zr-Nb-Ta-Mo refractory multi-principal element alloys typically exhibit high yield strength while tensile ductility tends to be poor. In this study, we found that even after solid solution treatment of Ti-Zr-Nb-Ta-Mo alloys, significant change in ductility occur due to the local chemical fluctuations. Ta's dramatic chemical fluctuations cause variations in atomic-scale strain fields, leading to reduced grain boundary strength and brittle fracture. First-principles calculations show that (Ti, Zr)-rich at the grain boundaries increases the delocalization of valence electrons, leading to longer bond lengths and reduced crystal orbital bond index values, thereby causing grain boundary embrittlement. Our findings explore the root causes of brittleness in Ti-Zr-Nb-Ta-Mo alloys at the atomic and electronic scales, providing not only a method to analyze grain boundary embrittlement using bond length, electronic localization function and crystal orbital bond index, but also a theoretical guidance for improving the mechanical properties via grain boundary structure optimization.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116438"},"PeriodicalIF":5.3,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ TEM investigation of the effect of nano twins on the evolution of He bubbles under thermo-mechanical coupling conditions 纳米孪晶对热机械耦合条件下 He 气泡演化影响的原位 TEM 研究

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-10-30 DOI: 10.1016/j.scriptamat.2024.116431

Chengpeng Liu, Xiang-Xi Ye, Hefei Huang

引用次数: 0

Comparing molecular dynamics simulations of grain growth with experimental data 晶粒生长的分子动力学模拟与实验数据的比较

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-10-30 DOI: 10.1016/j.scriptamat.2024.116429

Meizhong Lyu , Zipeng Xu , Gregory S. Rohrer , Elizabeth A. Holm

引用次数: 0

Deformation-induced ω phase transition in polycrystalline tungsten under extreme shock loading 极端冲击载荷下多晶钨中形变诱导的 ω 相变

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2024-10-30 DOI: 10.1016/j.scriptamat.2024.116432

Lei Zhang , Juan Ding , Jiatao Zhou , Baishan Chen , Yunzhu Ma , Yufeng Huang , Chaoping Liang , Wensheng Liu

{"title":"Deformation-induced ω phase transition in polycrystalline tungsten under extreme shock loading","authors":"Lei Zhang , Juan Ding , Jiatao Zhou , Baishan Chen , Yunzhu Ma , Yufeng Huang , Chaoping Liang , Wensheng Liu","doi":"10.1016/j.scriptamat.2024.116432","DOIUrl":"10.1016/j.scriptamat.2024.116432","url":null,"abstract":"<div><div>Tungsten(W) with the strongest metallic bonding and the highest melting point among metals, presents no phase transition before the melting temperature. Here we report the pristine body-centered cubic (BCC) α to metastable ω phase transformation in polycrystalline W under high-energy laser shock. The formation of ω phase is triggered by the collapse of atoms on two adjacent (111)α plane toward each other along <111>α direction. HADDF-STEM clearly shows the transition state hexagonal and the ideal ω phase form sequentially along the BCC/ω phase interface through different atomic displacement. First-principles calculations reveal that the energy required for BCC to ω transformation could be met at isostatic pressure lower than 200 GPa, which falls with the local stress concentration range of shock loading. Our findings not only unravel the new BCC/ω phase transition in W, but also shed lights to the plastic deformation mechanisms of strongly bonded materials under extreme shock loading.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"256 ","pages":"Article 116432"},"PeriodicalIF":5.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0