Acta Metallurgica Sinica-English Letters最新文献_第3页

Simultaneously Enhanced Strength and Fracture Resistance in HfNbTaTiZr Refractory High-Entropy Alloy at Higher Strain Rate 同时提高高应变速率下HfNbTaTiZr难熔高熵合金的强度和抗断裂性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-02-14 DOI: 10.1007/s40195-025-01826-0

Hong Chen, Ruitao Qu, Haotian Ma, Kexing Song, Feng Liu

{"title":"Simultaneously Enhanced Strength and Fracture Resistance in HfNbTaTiZr Refractory High-Entropy Alloy at Higher Strain Rate","authors":"Hong Chen, Ruitao Qu, Haotian Ma, Kexing Song, Feng Liu","doi":"10.1007/s40195-025-01826-0","DOIUrl":"10.1007/s40195-025-01826-0","url":null,"abstract":"<div>The effects of strain rate on tensile properties and fracture behavior of HfNbTaTiZr refractory high-entropy alloy (RHEA) were investigated. With the increase of strain rate in the range from 0.0001 to 0.1 s−1, the yield strength increases from 740 to 825 MPa, demonstrating a strain rate sensitivity coefficient of 0.0173. Notably, while the uniform elongation diminished with rising strain rates, the fracture elongation of the RHEA remained constant at ~ 43%, suggesting an enhanced non-uniform elongation and an improved resistance to tensile fracture. Single-edge notch tension test further proves that the notch toughness increases at elevated loading rates. The complete work-hardening rate curves were plotted, and the work-hardening ability of the RHEA was found not decreasing significantly after necking, especially at high strain rate. The fracture of tensile samples across all the strain rates was dominated by void growth and coalesce, with dimples on the fracture surface being smaller at higher strain rates. This work reveals an unconventional increase in fracture resistance at higher strain rates, further indicating that ductile RHEAs may possess superior potential for use in structural applications subjected to high strain rate loading.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 4","pages":"529 - 541"},"PeriodicalIF":2.9,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830848","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

Low Thermal Conductivity Contributes to High Thermoelectric Performance: A Review 低导热系数有助于高热电性能：综述

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-02-08 DOI: 10.1007/s40195-025-01817-1

Haolin Ye, Chongjian Zhou

{"title":"Low Thermal Conductivity Contributes to High Thermoelectric Performance: A Review","authors":"Haolin Ye, Chongjian Zhou","doi":"10.1007/s40195-025-01817-1","DOIUrl":"10.1007/s40195-025-01817-1","url":null,"abstract":"<div>Thermoelectric materials directly convert thermal energy into electrical energy, demonstrating significant potential for energy and environmental applications. Ideally, high-performance thermoelectric materials should exhibit ultra-low lattice thermal conductivity and high charge carrier mobility akin to a phonon-glass electron-crystal. However, the strong coupling between electronic transport and phonon transport presents considerable challenges in enhancing thermoelectric performance, with the independence of lattice thermal conductivity being the key to decoupling these processes. This review emphasizes the critical role of low lattice thermal conductivity in enhancing the performance of thermoelectric materials. It begins by exploring the low thermal conductivity features arising from the intrinsic structures of these materials, including anharmonic structures and super-nanostructures. We then propose innovative strategies for tuning thermal conductivity through phase engineering. Additionally, we review recent advancements in defect engineering aimed at reducing lattice thermal conductivity in the thermoelectric field. Finally, we discuss emerging developments, applications, and challenges in the field of thermoelectric materials.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 5","pages":"720 - 732"},"PeriodicalIF":2.9,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892654","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

Effect of K2HPO4 Concentration on the Formation, Structure, Composition and Protectiveness of Conversion Coating Deposited on AZ31 Magnesium Alloy K2HPO4浓度对AZ31镁合金转化涂层形成、结构、组成及防护性能的影响

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-22 DOI: 10.1007/s40195-025-01815-3

Liping Wu, Junhua Dong, Xianfei Zheng, Zhongying Wang, Xiaoying Sun, Xiuling Shang, Wei Ke, Changgang Wang

{"title":"Effect of K2HPO4 Concentration on the Formation, Structure, Composition and Protectiveness of Conversion Coating Deposited on AZ31 Magnesium Alloy","authors":"Liping Wu, Junhua Dong, Xianfei Zheng, Zhongying Wang, Xiaoying Sun, Xiuling Shang, Wei Ke, Changgang Wang","doi":"10.1007/s40195-025-01815-3","DOIUrl":"10.1007/s40195-025-01815-3","url":null,"abstract":"<div>In deaerated 0.05 M, 0.1 M, 0.2 M and 0.5 M K2HPO4 solutions with pH 9.5, AZ31 magnesium (Mg) alloy was subjected to potentiostatic polarization at − 0.8 VSCE to deposit a phosphate conversion coating. The morphology, structure, chemical composition, and protective performance of the conversion coating during the formation process were characterized. The results showed that amorphous Mg(OH)2 and MgHPO4 and crystallized KMgPO4·6H2O (struvite–K) were successively deposited on the surface of AZ31 Mg alloy in the four solutions. MgHPO4 was converted from Mg(OH)2, while struvite–K was transformed from MgHPO4. The distribution of Mg(OH)2, MgHPO4 and struvite–K along the thickness of the coating differs with K2HPO4 concentration. As the concentration of K2HPO4 increased, the coating time was gradually shortened, and the coating was gradually thinned. Meanwhile, the ratio of the nucleation rate to the growth rate of struvite–K crystal nuclei increased, resulting in a decrease in the size of struvite–K crystal. When the concentration of K2HPO4 increased from 0.05 to 0.1 M, the content of struvite–K increased, and the protective performance of the coating was enhanced. However, as the concentration of K2HPO4 continued to increase to 0.5 M, the content of struvite–K and the protective performance of the coating decreased.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 3","pages":"481 - 496"},"PeriodicalIF":2.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521669","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

Thermoelectric Performance of Layered PbBi4Te7 Compound 层状PbBi4Te7化合物的热电性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-22 DOI: 10.1007/s40195-024-01811-z

Hong Zeng, Liqing Xu, Wei Liu, Xinxiu Cheng, Wenke He, Yu Xiao

{"title":"Thermoelectric Performance of Layered PbBi4Te7 Compound","authors":"Hong Zeng, Liqing Xu, Wei Liu, Xinxiu Cheng, Wenke He, Yu Xiao","doi":"10.1007/s40195-024-01811-z","DOIUrl":"10.1007/s40195-024-01811-z","url":null,"abstract":"<div>The layered PbBi4Te7 compound is considered a promising thermoelectric material due to its unusually high electrical transport properties in ternary compound systems. However, its high carrier concentration leads to relatively high thermal conductivity and low Seebeck coefficient, limiting the enhancement of its thermoelectric performance. In this work, we introduce Se alloying and Cu doping to synergistically regulate the thermoelectric transport properties of PbBi4Te7. Se alloying induces strong lattice contraction and increased interlayer electron scattering, significantly reducing lattice thermal conductivity while enhancing the Seebeck coefficient. Besides, Cu doping forms interlayer electron transport channels thus optimizing carrier mobility and electrical transport properties. Cu substitution also enhances point defect scattering further suppressing phonon transport. Ultimately, the strong anharmonic structure formed by Se alloying and Cu-induced phonon scattering results in a remarkably low lattice thermal conductivity of 0.27 W m−1 K−1 at 300 K in PbBi4Te5Se2-0.1% Cu samples. The maximum thermoelectric figure of merit (ZTmax) is increased to 0.68, with an average thermoelectric figure of merit (ZTave) of 0.56 in the near-room temperature range (300–573 K), outperforming other typical ternary Pb-Bi-based compounds.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 5","pages":"772 - 780"},"PeriodicalIF":2.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892625","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-Depth Understanding the Retained Austenite Stability on the Susceptibility of Multi-Alloying Ultra-Strength Steel to Hydrogen-Induced Cracking 残留奥氏体稳定性对多合金化超强钢氢致开裂敏感性的深入研究

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-22 DOI: 10.1007/s40195-024-01809-7

Chao Hai, Kang Huang, Cuiwei Du, Xiaogang Li

{"title":"In-Depth Understanding the Retained Austenite Stability on the Susceptibility of Multi-Alloying Ultra-Strength Steel to Hydrogen-Induced Cracking","authors":"Chao Hai, Kang Huang, Cuiwei Du, Xiaogang Li","doi":"10.1007/s40195-024-01809-7","DOIUrl":"10.1007/s40195-024-01809-7","url":null,"abstract":"<div>Hydrogen-induced cracking (HIC) is one of the most complex material problems that hydrogen can diffuse into and interact with microstructure, degrading their mechanical properties. Microstructural modification is an effective way to enhance the resistance to HIC. The present study focused on the relationship between the retained austenite (RA) and HIC behavior in NiCrMoV/Nb multi-alloying ultra-strength steel. Results demonstrated that the maximum volume fraction of RA of 9.31% was obtained for QL30T specimen. After the deep cryogenic pretreatment, the volume fraction of RA reduced to 8.8%. RA could reduce the effective diffusion coefficient, while deep cryogenic pretreatment increased the susceptibility of the steel to HIC by a maxim of 14.8%. This was mainly due to the transformation of retained austenite into martensite, degrading the mechanical properties under hydrogen-charged condition. In addition, the deep cryogenic pretreatment had a significant effect on the crack initiation and propagation, with the intergranular (IG) fracture becoming the dominant fracture mode where an increase in the number of secondary cracks in the section. The interfaces of RA and matrix, as well as the grain boundaries, were the preferred sites for cracks initiation.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 4","pages":"691 - 704"},"PeriodicalIF":2.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830936","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 Vitro Corrosion Behavior and Mechanical Property of Novel Mg–Sn–In–Ga Alloys for Orthopedic Applications 新型骨科用Mg-Sn-In-Ga合金的体外腐蚀行为和力学性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-16 DOI: 10.1007/s40195-024-01800-2

Jing Wang, Xuejian Wang, Zongning Chen, Huijun Kang, Tongmin Wang, Enyu Guo

{"title":"In Vitro Corrosion Behavior and Mechanical Property of Novel Mg–Sn–In–Ga Alloys for Orthopedic Applications","authors":"Jing Wang, Xuejian Wang, Zongning Chen, Huijun Kang, Tongmin Wang, Enyu Guo","doi":"10.1007/s40195-024-01800-2","DOIUrl":"10.1007/s40195-024-01800-2","url":null,"abstract":"<div>This study develops novel Mg–Sn–In–Ga alloys as potential implant materials for orthopedic applications. The corrosion behavior of the Mg–Sn–In–Ga alloys was studied through mass loss measurements, hydrogen evolution measurements, electrochemical analysis, and corrosion morphology observations. The results show that the corrosion rate of the Mg–1Sn–1In–1Ga alloy was only 0.10 ± 0.003 mm/y after immersion in Hank’s solution for 15 days. This outstanding corrosion resistance was associated with the protective effect of the corrosion products. The increase in the Sn and Ga element content led to the precipitation of a large amount of Mg2Sn and Mg5Ga2, which had a dominant effect on the corrosion rate in the Mg–5Sn–1In–2Ga alloy. These precipitates increased the current density and detached from the alloy surface during the corrosion process. This can lead to a weakened protective effect of the corrosion layer, and thus generate localized corrosion and an increase in the corrosion rate. The strength of the Mg–5Sn–1In–2Ga alloy was enhanced due to fine-grain strengthening and precipitation strengthening. The ultimate tensile strength and yield strength of the Mg–5Sn–1In–2Ga alloy were ~ 309 MPa and ~ 253 MPa, respectively.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 3","pages":"353 - 366"},"PeriodicalIF":2.9,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521700","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

Copper Precipitation Behavior and Mechanical Properties of Cu-Bearing Ferritic Stainless Steel with Different Cr Addition 不同Cr添加量含cu铁素体不锈钢的铜析出行为及力学性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-15 DOI: 10.1007/s40195-025-01814-4

Yifan Li, Shengyao Ma, Xinrui Zhang, Tong Xi, Chunguang Yang, Hanyu Zhao, Ke Yang

{"title":"Copper Precipitation Behavior and Mechanical Properties of Cu-Bearing Ferritic Stainless Steel with Different Cr Addition","authors":"Yifan Li, Shengyao Ma, Xinrui Zhang, Tong Xi, Chunguang Yang, Hanyu Zhao, Ke Yang","doi":"10.1007/s40195-025-01814-4","DOIUrl":"10.1007/s40195-025-01814-4","url":null,"abstract":"<div>The microstructure evolution and mechanical properties of Cu-bearing ferritic stainless steel with different Cr addition (Cr = 12, 15 and 17 wt%) were investigated. The phase transformation behavior under different cooling rate, Cu-rich precipitation behavior and its influence on the mechanical properties under different aging treatment are systematically characterized using dilatometry, differential scanning calorimeter (DSC) and transmission electron microscopy (TEM). The results indicated that the increase in Cr content narrowed the austenite phase region at high temperatures, affecting its microstructure under different cooling rates. The 12Cr-1.5Cu steel exhibited a fully austenitic phase region at high temperature and occurred apparent martensitic transformation after air cooling. Cooling rate significantly influenced the phase transition of the steels, and subsequently affected its mechanical properties. All three investigated steels showed higher strength and lower plasticity in air cooling condition compared to furnace cooling condition, due to the presence of martensite. After aging treatment, high number densities of Cu-rich precipitates were formed in steel matrix and the size of Cu-rich precipitates increased obviously with increasing aging temperature, while the tendency for number density was opposite. Fine and dispersed Cu-rich precipitates formed during low-temperature aging enhanced strength of the steels, while larger Cu-rich phases developed during high-temperature aging endowed greater ductility to the steels. Notably, the Cr content had no significant effect on the precipitation behavior of Cu-rich precipitation. These comprehensive results and analyses could provide a solid foundation for broader applications of Cu-bearing ferritic stainless steels.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 3","pages":"383 - 395"},"PeriodicalIF":2.9,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521699","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

A Novel BCC/B2 Structural Nb38Ti35Al15V6Cr4(TaHfMoW)2 Refractory High-Entropy Alloy with Excellent Specific Yield Strength-Plasticity Synergy 新型BCC/B2结构Nb38Ti35Al15V6Cr4(TaHfMoW)2耐火高熵合金，具有优异的比屈服强度-塑性协同效应

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-13 DOI: 10.1007/s40195-024-01805-x

Hongbin Liu, Zhenqiang Xing, Yitong Yang, Jingyu Pang, Wen Li, Zhengwang Zhu, Long Zhang, Aimin Wang, Haifeng Zhang, Hongwei Zhang

{"title":"A Novel BCC/B2 Structural Nb38Ti35Al15V6Cr4(TaHfMoW)2 Refractory High-Entropy Alloy with Excellent Specific Yield Strength-Plasticity Synergy","authors":"Hongbin Liu, Zhenqiang Xing, Yitong Yang, Jingyu Pang, Wen Li, Zhengwang Zhu, Long Zhang, Aimin Wang, Haifeng Zhang, Hongwei Zhang","doi":"10.1007/s40195-024-01805-x","DOIUrl":"10.1007/s40195-024-01805-x","url":null,"abstract":"<div>Refractory high-entropy alloys (RHEAs) stand as promising candidates for the development of a new generation of high-temperature materials due to their exceptional mechanical properties. However, the inherent low ductility and high density of RHEAs have hindered their widespread adoption in industrial applications. In this study, an Nb38Ti35Al15V6Cr4(TaHfMoW)2 RHEA with a BCC/B2 dual-phase structure is successfully developed. The RHEA exhibits excellent specific yield strength of 162.4 MPa·g−1·cm3 and 84.3 MPa·g−1·cm3 at room temperature (RT) and 800 °C, respectively. It was found that the pinning effect of the B2 phase induces a gradual transition in dislocation slip mode from planar slip to cross slip, homogenizing the plastic flow and resulting in excellent compression plasticity (ε > 50%). Additionally, the B2 phase endows the alloy with excellent yield strength at high temperatures by precipitation strengthening. Moreover, the dominated a/2 < 111 > type dislocation contributes to the alloy's superior plasticity at high temperatures.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 3","pages":"396 - 406"},"PeriodicalIF":2.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521682","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

Roles of Y2Zr2O7 Nano-Oxides in Helium Management in ODS Ferritic Alloys: A First-Principles Study 纳米氧化物Y2Zr2O7在ODS铁素体合金氦管理中的作用：第一性原理研究

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-13 DOI: 10.1007/s40195-024-01813-x

Huajian Wu, Jieli Ma, Yong Jiang, Yiren Wang, Fuhua Cao

{"title":"Roles of Y2Zr2O7 Nano-Oxides in Helium Management in ODS Ferritic Alloys: A First-Principles Study","authors":"Huajian Wu, Jieli Ma, Yong Jiang, Yiren Wang, Fuhua Cao","doi":"10.1007/s40195-024-01813-x","DOIUrl":"10.1007/s40195-024-01813-x","url":null,"abstract":"<div>Y–Zr–O nano-oxide dispersion-strengthened (ODS) ferritic alloys have attracted increasing research efforts in recent years, for the enhanced nucleation and refinement of nano-oxides. Here, we report a first-principles exploration on the possible roles of Y2Zr2O7 in helium management in Y + Zr and Y + Ti + Zr co-alloyed ODS ferritic alloys. Bulk phase calculations suggested that similarly as Y2Ti2O7, Y2Zr2O7 has a comparably strong capability for trapping helium at its interstitial sites. The equilibrium Fe/Y2Zr2O7 interface structure was further predicted as the top-coordinated O-rich at the temperature range of interest. Vacancy and helium both segregate to the Y2Zr2O7 interface, in preference to the Y2Ti2O7 interface, the bulk interior of Y2Zr2O7 and the grain boundaries. In this regard, Y2Zr2O7 can be more effective than Y2Ti2O7 in preventing vacancies and helium from reaching GBs. Based on these results, the profound implications for the helium tolerance of Zr-alloyed ODS ferritic alloys were discussed.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 3","pages":"497 - 506"},"PeriodicalIF":2.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521683","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

One-Step Carrier Modulation and Nano-Composition Enhancing Thermoelectric and Mechanical Properties of p-Type SnSe Polycrystals by Introducing Ag9GaSe6 Compound 引入Ag9GaSe6化合物提高p型SnSe多晶热电性能和力学性能的一步载流子调制和纳米复合

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2025-01-13 DOI: 10.1007/s40195-024-01810-0

Ze Li, Xing Yang, Tian-En Shi, Wang-Qi Bao, Jing Feng, Zhen-Hua Ge

{"title":"One-Step Carrier Modulation and Nano-Composition Enhancing Thermoelectric and Mechanical Properties of p-Type SnSe Polycrystals by Introducing Ag9GaSe6 Compound","authors":"Ze Li, Xing Yang, Tian-En Shi, Wang-Qi Bao, Jing Feng, Zhen-Hua Ge","doi":"10.1007/s40195-024-01810-0","DOIUrl":"10.1007/s40195-024-01810-0","url":null,"abstract":"<div>The group IV–VI semiconductor, SnSe, is abundant on the earth and is a promising thermoelectric (TE) material due to its low thermal conductivity. However, the p-type SnSe polycrystals have low electrical conductivities due to their low carrier concentration, significantly limiting their further applications. This study introduced the argyrodite-type Ag9GaSe6 compound into the SnSe matrix to effectively increase the hole carrier concentration, increasing the electrical conductivity. A high electrical conductivity of 50.5 S cm−1 was obtained for the SnSe + 0.5 wt% Ag9GaSe6 sample at 323 K. Due to the increased electrical conductivity, the SnSe + 0.5 wt% Ag9GaSe6 sample had an average power factor (PFave) value of ~ 410 μW m–1 K–2 in the 323–823 K temperature range, a nearly four times enhancement compared to the undoped SnSe sample. Additionally, the thermal conductivity slightly increased due to the introduction of the Ag9GaSe6 compound. However, the electrical transport properties were significantly enhanced, making up for the improvement in thermal conductivity. Consequently, the SnSe + 0.5 wt% Ag9GaSe6 sample obtained a peak thermoelectric figure of merit ZT value of ~1.2 at 823 K and a ZTave value of 0.58 in the 323–823 K temperature range. The proposed strategy improved the ZT and ZTave values of SnSe-based TE materials at room temperature and provided a systematic strategy for modifying SnSe-based TE materials. Moreover, the thermoelectric properties of SnSe can be effectively improved by introducing the Ag9GaSe6 compound for doping, and waste heat power generation can be effectively carried out in the middle temperature region.</div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"38 5","pages":"781 - 792"},"PeriodicalIF":2.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892722","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