Scripta Materialia最新文献_第4页

Role of the third composition and its A-site cation off-centering mechanism in ternary BiFeO3‒BaTiO3-based piezoelectric ceramics

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-13 DOI: 10.1016/j.scriptamat.2025.116637

Hyunwook Nam , Sangwook Kim , Ichiro Fujii , Motoki Aruga , Shintaro Ueno , Yoshihiro Kuroiwa , Satoshi Wada

{"title":"Role of the third composition and its A-site cation off-centering mechanism in ternary BiFeO3‒BaTiO3-based piezoelectric ceramics","authors":"Hyunwook Nam , Sangwook Kim , Ichiro Fujii , Motoki Aruga , Shintaro Ueno , Yoshihiro Kuroiwa , Satoshi Wada","doi":"10.1016/j.scriptamat.2025.116637","DOIUrl":"10.1016/j.scriptamat.2025.116637","url":null,"abstract":"<div><div>Ternary BiFeO<sub>3</sub>‒BaTiO<sub>3</sub> (BFBT)-based ceramics often exhibit a higher piezoelectricity compared to binary BFBT ceramics. However, the origin of the enhanced piezoelectricity in ternary ceramics remains unclear. In this study, we investigated the role of the third composition by examining the pseudo-cubic symmetry of Bi(Mg<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub> (BMT)-modified BFBT piezoelectric ceramics using high-energy synchrotron radiation X-ray diffraction and the Rietveld method. Our experimental results validate the critical influence of Bi ion off-centering displacement, as the largest Bi ion off-centering displacement at a specific third composition demonstrates the highest piezoelectric properties. The displacement of Bi ions varies with the Bi-O covalent bond length and repulsive interactions between the off-centered Bi and B-site cations. This study highlights the importance of the ionic radii of the B-site cations in the third composition for high-performance BFBT-based piezoelectric ceramics.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"262 ","pages":"Article 116637"},"PeriodicalIF":5.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation of an ordered phase in hcp precipitates during aging of bcc HfNbTaTiZr high-entropy alloy

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-12 DOI: 10.1016/j.scriptamat.2025.116634

Yujun Zhao , Felix Großwendt , Maik Rajkowski , Parham Gemagami , Régis Poulain , Loïc Perrière , Jean-Philippe Couzinié , Sebastian Weber , Guillaume Laplanche , Tong Li

引用次数: 0

A cold-welding map incorporating various competing mechanisms and size effects

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-11 DOI: 10.1016/j.scriptamat.2025.116646

Bo Song , Peng Dong , Xin Zhai , Dan Luo , Yanfei Gao

引用次数: 0

New polymorph γ-CuWO4 inspired by γ-CuMoO4: Experimental identification and theoretical verification

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-10 DOI: 10.1016/j.scriptamat.2025.116635

Jiri Houska, Stanislav Haviar, Jiri Capek, Radomir Cerstvy, Kalyani Shaji, Nirmal Kumar, Petr Zeman

引用次数: 0

Formation mechanism of β precipitate within α′ martensite in α+β titanium alloys

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-08 DOI: 10.1016/j.scriptamat.2025.116632

Xin Hu , Chaoqiang Liu , Zhenggang Wu , Min Song

{"title":"Formation mechanism of β precipitate within α′ martensite in α+β titanium alloys","authors":"Xin Hu , Chaoqiang Liu , Zhenggang Wu , Min Song","doi":"10.1016/j.scriptamat.2025.116632","DOIUrl":"10.1016/j.scriptamat.2025.116632","url":null,"abstract":"<div><div>The precipitation mechanism of β within α′ martensite was systematically investigated in a representative Ti-2 wt.%Mo α+β alloy using atomic-resolution high-angle annular dark-field scanning transmission electron microscopy. The β precipitates consistently form on <em><strong>a</strong></em> perfect dislocations generated during the α′ martensitic transformation and exhibit a plate-like morphology with six variants. Their habit plane is oriented normal to the <strong>Δg</strong> vector (<strong>Δg</strong> = <strong>g</strong> (<span><math><mrow><mn>01</mn><mover><mrow><mn>1</mn></mrow><mo>‾</mo></mover></mrow></math></span>)<sub>β</sub>-<strong>g</strong>(<span><math><mrow><mn>1</mn><mover><mrow><mn>1</mn></mrow><mo>‾</mo></mover><mn>00</mn></mrow></math></span>)<sub>α′</sub>). The formation of β structure from α′ lattice involves a shear on the {<span><math><mrow><mn>01</mn><mover><mrow><mn>1</mn></mrow><mo>‾</mo></mover><mn>0</mn></mrow></math></span>}<sub>α′</sub> plane, accompanied by an atomic shuffle on alternate (0001)<sub>α′</sub> plane. This shear generates two <em><strong>a</strong></em>/2 partial dislocations with opposite Burgers vector directions and the <strong><em>a</em></strong> perfect dislocation within α′ matrix can react with one of these partials, such as -<em><strong>a</strong></em>/ 2 + <em><strong>a</strong></em> → <em><strong>a</strong></em>/2, thereby reducing the system energy. The thickening of β precipitates is achieved by the accumulation of opposite shear, which minimizes the shear strain induced by β precipitation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"262 ","pages":"Article 116632"},"PeriodicalIF":5.3,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577571","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

Temperature-dependent shear behavior of the β′ phase and its effect on high-temperature mechanical properties in magnesium alloy

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-05 DOI: 10.1016/j.scriptamat.2025.116631

Jianxin Zhou , Hong Yang , Yuyang Gao , Wenlong Xie , Zhihua Dong , Bin Jiang , Fusheng Pan

{"title":"Temperature-dependent shear behavior of the β′ phase and its effect on high-temperature mechanical properties in magnesium alloy","authors":"Jianxin Zhou , Hong Yang , Yuyang Gao , Wenlong Xie , Zhihua Dong , Bin Jiang , Fusheng Pan","doi":"10.1016/j.scriptamat.2025.116631","DOIUrl":"10.1016/j.scriptamat.2025.116631","url":null,"abstract":"<div><div>The unique temperature-dependent shear behavior of the β′ phase in Mg-6Gd-5Y-1Zn-0.3Zr alloy was elucidated and its influence on high-temperature strength was discussed in depth. The β′ phase enhanced strength at room temperature (RT) and 250 °C, but the strength decreased sharply at 300 °C and 350 °C due to the increased susceptibility of β′ phase. At RT, the intrinsic properties of the β′ phase determined its ability to hinder dislocation movement without undergoing shear. At 250 °C, the thermal resistance of the β′ phase decreased, permitting shearing by basal 〈<em>a〉</em> dislocations but limiting pyramidal 〈<em>c</em> + <em>a〉</em> dislocation movement. At 300 °C, enhanced atomic mobility allowed basal 〈<em>a〉</em> and pyramidal 〈<em>c</em> + <em>a〉</em> dislocations to shear the β′ phase easily, causing rapid strength degradation. At 350 °C, the β′ phase completely dissolved. This study pioneers the exploration of the temperature-dependent shear behavior of the β′ phase, which aids future high-temperature applications of β′ phase-containing alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"261 ","pages":"Article 116631"},"PeriodicalIF":5.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548686","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

Thermal stability and phase evolution of topological nodal-line semimetal PtSn₄ using synchrotron X-ray powder diffraction

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-03 DOI: 10.1016/j.scriptamat.2025.116627

Satheasuweatha M. N , Lara Gigli , Nicola Demitri , C.S. Lue , C.N. Kuo , Sonachalam Arumugam , Boby Joseph

引用次数: 0

Anisotropy breaking in high level piezoelectric energy harvesting

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-03 DOI: 10.1016/j.scriptamat.2025.116629

Gaspard Taxil , Mickaël Lallart , Hung Hoang Nguyen , Benjamin Ducharne , Hiroki Kuwano , Takahito Ono , Gaël Sebald

{"title":"Anisotropy breaking in high level piezoelectric energy harvesting","authors":"Gaspard Taxil , Mickaël Lallart , Hung Hoang Nguyen , Benjamin Ducharne , Hiroki Kuwano , Takahito Ono , Gaël Sebald","doi":"10.1016/j.scriptamat.2025.116629","DOIUrl":"10.1016/j.scriptamat.2025.116629","url":null,"abstract":"<div><div>This study focused on mechanical energy harvesting and particularly on the difference between low and high levels of stress and electric fields. Energy conversion abilities were assessed through Ericsson cycle involving the application and release of electric field and stress at different phases of the cycle. The investigation focused on PMN-27PT single crystals known for their exceptional piezoelectric coefficient. Different crystal directions were examined through both experimentation and modeling using the Landau–Devonshire theory. Results unveiled a significant contrast between low and high-stress regimes. With low-level energy harvesting, orientation dependence of the energy density follows the <span><math><msub><mrow><mi>d</mi></mrow><mrow><mn>33</mn></mrow></msub></math></span> piezoelectric coefficients symmetry, which is highly dependent on the crystal direction. However, our results under high levels indicated a more complex behavior caused by such conditions, yielding a more homogeneous energy distribution. Experimental assessments align well with modeling ones, confirming the unique response of ferroelectric materials when nonlinearities of polarization are involved.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"261 ","pages":"Article 116629"},"PeriodicalIF":5.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on plastic deformation and machinability of zone-melted N-type bismuth telluride thermoelectric materials 带状熔融 N 型碲化铋热电材料的塑性变形和可加工性研究

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-03-01 DOI: 10.1016/j.scriptamat.2025.116630

Chen Ji , Quansheng Chen , Zhili Hu , Wenyu Zhao , Lin Hua

{"title":"Research on plastic deformation and machinability of zone-melted N-type bismuth telluride thermoelectric materials","authors":"Chen Ji , Quansheng Chen , Zhili Hu , Wenyu Zhao , Lin Hua","doi":"10.1016/j.scriptamat.2025.116630","DOIUrl":"10.1016/j.scriptamat.2025.116630","url":null,"abstract":"<div><div>Bismuth telluride, a leading thermoelectric material in the medium-to-low temperature range, is widely used in thermoelectric cooling and power generation. However, its brittleness limits plastic deformation and machinability, restricting miniaturization of thermoelectric devices. This paper introduces a stress-temperature plasticizing process that enables bismuth telluride to achieve over 50 % plastic deformation. Finite element simulations indicate the material remains under compressive stress, preventing cleavage along its layered structure. SEM analysis reveals that post-deformation, the internal structure shifts to a wrinkled form. After 40 % plastic deformation, the hardness of the sample on the plane parallel to the pressure direction increased by nearly 60 %, with greater stress leading to a larger increase in hardness. Following 30 % plastic deformation, the minimum machining size of bismuth telluride bulk samples during chip cutting was reduced to 0.26 mm, significantly improving the machinability, while the ZT value remained comparable to that of the matrix, ensuring excellent thermoelectric performance.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"261 ","pages":"Article 116630"},"PeriodicalIF":5.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520563","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

An unusual approach significantly improving the magnetostrain performance of Ni-Mn-Ga composite materials

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-02-28 DOI: 10.1016/j.scriptamat.2025.116624

DongKeun Han , Wan-Ting Chiu , Masaki Tahara , Naoki Nohira , Volodymyr Chernenko , Senentxu Lanceros-Mendez , Hideki Hosoda

引用次数: 0