Copper alloy suspension wires are used in the optical pickups and image stabilization mechanisms of mobile cameras. The durability of suspension wires used in mobile cameras is greatly affected by the increase in the weight of the lens assembly as makers improve the image quality of the camera. Therefore, the durability of the wire needs improvement. In this study, the stress reduction effect of twisted suspension wires was investigated using finite element method (FEM) analysis. In addition, a practical equation was obtained to facilitate the structural design. From this study, the following conclusions were obtained. In contrast to the conventional single-wire structure, the twisted wire structure enables a significant reduction in the stress generated while maintaining the stiffness. A simple formula that approximates the results of many FEM analyses was developed to enable rapid product design.
{"title":"Development of Structural Design Method for Twisted Wires Suspension","authors":"Haruki Kumamoto, Kenji Saka, Kazunari Yoshida, Hiroaki Kubota","doi":"10.2320/matertrans.mt-d2022012","DOIUrl":"https://doi.org/10.2320/matertrans.mt-d2022012","url":null,"abstract":"Copper alloy suspension wires are used in the optical pickups and image stabilization mechanisms of mobile cameras. The durability of suspension wires used in mobile cameras is greatly affected by the increase in the weight of the lens assembly as makers improve the image quality of the camera. Therefore, the durability of the wire needs improvement. In this study, the stress reduction effect of twisted suspension wires was investigated using finite element method (FEM) analysis. In addition, a practical equation was obtained to facilitate the structural design. From this study, the following conclusions were obtained. In contrast to the conventional single-wire structure, the twisted wire structure enables a significant reduction in the stress generated while maintaining the stiffness. A simple formula that approximates the results of many FEM analyses was developed to enable rapid product design.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135671273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.2320/matertrans.mt-mf2022049
D. Fruchart, N. Skryabina, P. de Rango, Marjan Fouladvind, V. Aptukov
{"title":"Severe Plastic Deformation by Fast Forging to Easy Produce Hydride from Bulk Mg-Based Alloys","authors":"D. Fruchart, N. Skryabina, P. de Rango, Marjan Fouladvind, V. Aptukov","doi":"10.2320/matertrans.mt-mf2022049","DOIUrl":"https://doi.org/10.2320/matertrans.mt-mf2022049","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44044208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.2320/matertrans.mt-m2023023
P. Thanh, N. Ngoc, K. X. Hau, N. H. Yen, T. V. Anh, N. H. Dan
{"title":"Coercivity Enhancement of Sintered Nd–Fe–B Magnets by Intergranular Adding Micro-Structured Dy–Nd–Pr–Al–Cu Powder","authors":"P. Thanh, N. Ngoc, K. X. Hau, N. H. Yen, T. V. Anh, N. H. Dan","doi":"10.2320/matertrans.mt-m2023023","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023023","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41524999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.2320/matertrans.mt-mf2022007
M. Zohrevand, Ali Reza Rezaei, M. Sabour, Erfan Taherkhani, G. Faraji
{"title":"Recent Progress on SPD Processes Empowered by Hydrostatic Pressure","authors":"M. Zohrevand, Ali Reza Rezaei, M. Sabour, Erfan Taherkhani, G. Faraji","doi":"10.2320/matertrans.mt-mf2022007","DOIUrl":"https://doi.org/10.2320/matertrans.mt-mf2022007","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69119657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solidification microstructure in Fe-based Fe–X-based metallic glasses (X = Cu, Ag, Au, Pd, Pt, Rh, Ir, Ru, Os, Re, Hg) (X is a noble metallic element) with liquid phase separation (LPS) was categorized. Only Fe–Cu-based and Fe–Ag-based metallic glasses with liquid phase separation were reported among Fe–X-based alloys. Fe–P–C–Ag immiscible metallic glasses which showed liquid-phase separation were designed using the alloy parameters of mixing enthalpy, the ground state diagrams constructed by the Materials Project, and Calculation of Phase Diagrams (CALPHAD). Macroscopically separated ribbons composed of FCC-Ag entangled ribbons and Fe–P–C metallic glass ribbons were obtained by a melt-spinning method. The formation mechanism of the macroscopically separated ribbons in Fe–P–C–Ag immiscible metallic glasses is described with LPS behavior and melt-spinning process in this study.
{"title":"Alloy Design and Solidification Microstructure Analysis in Fe–P–C–Ag Immiscible Metallic Glass","authors":"Takeshi Nagase, Tomoyuki Terai, Mitsuaki Matsumuro, Mamoru Takemura","doi":"10.2320/matertrans.mt-y2023001","DOIUrl":"https://doi.org/10.2320/matertrans.mt-y2023001","url":null,"abstract":"Solidification microstructure in Fe-based Fe–X-based metallic glasses (X = Cu, Ag, Au, Pd, Pt, Rh, Ir, Ru, Os, Re, Hg) (X is a noble metallic element) with liquid phase separation (LPS) was categorized. Only Fe–Cu-based and Fe–Ag-based metallic glasses with liquid phase separation were reported among Fe–X-based alloys. Fe–P–C–Ag immiscible metallic glasses which showed liquid-phase separation were designed using the alloy parameters of mixing enthalpy, the ground state diagrams constructed by the Materials Project, and Calculation of Phase Diagrams (CALPHAD). Macroscopically separated ribbons composed of FCC-Ag entangled ribbons and Fe–P–C metallic glass ribbons were obtained by a melt-spinning method. The formation mechanism of the macroscopically separated ribbons in Fe–P–C–Ag immiscible metallic glasses is described with LPS behavior and melt-spinning process in this study.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135872102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.2320/matertrans.mt-m2022217
Takuya Hashimoto, Ken-ichi Ikeda, Seiji Miura
Nanoindentation tests were conducted near the grain boundary (GB) of the Al–Mg–Si alloy, and the influence of GB character on the aging precipitation behavior and the mechanical properties was confirmed. After obtaining the GB characters by electron back scattered diffraction (EBSD) analysis and nanoindentation tests were carried out on under-aged, peak-aged, and over-aged samples. And then, the indentation areas were observed by back scattered electrons imaging (BSE) in order to identify indentation positions to the GB. In this study, for the GB character, focusing on the rotation angle, the high-angle GB (HAGB) and the low-angle GB (LAGB) were selected. In addition, coincidence site lattice GBs (CSL) were selected as the special GB. In the 180°C under-aged sample, the nano-hardness near GB is higher than that far from GB, while 180°C peak-aged and 250°C aged samples, the nano-hardness is lower than that far from GB. Then the amount of change in hardness of HAGB was larger than that of the LAGB. This suggests that the GB character affects the aging precipitation behavior and mechanical properties.
{"title":"Effect of Grain Boundary Characters on Precipitation Behavior and Local Deformation Behavior in Al–Mg–Si Alloy","authors":"Takuya Hashimoto, Ken-ichi Ikeda, Seiji Miura","doi":"10.2320/matertrans.mt-m2022217","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2022217","url":null,"abstract":"Nanoindentation tests were conducted near the grain boundary (GB) of the Al–Mg–Si alloy, and the influence of GB character on the aging precipitation behavior and the mechanical properties was confirmed. After obtaining the GB characters by electron back scattered diffraction (EBSD) analysis and nanoindentation tests were carried out on under-aged, peak-aged, and over-aged samples. And then, the indentation areas were observed by back scattered electrons imaging (BSE) in order to identify indentation positions to the GB. In this study, for the GB character, focusing on the rotation angle, the high-angle GB (HAGB) and the low-angle GB (LAGB) were selected. In addition, coincidence site lattice GBs (CSL) were selected as the special GB. In the 180°C under-aged sample, the nano-hardness near GB is higher than that far from GB, while 180°C peak-aged and 250°C aged samples, the nano-hardness is lower than that far from GB. Then the amount of change in hardness of HAGB was larger than that of the LAGB. This suggests that the GB character affects the aging precipitation behavior and mechanical properties.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135872424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.2320/matertrans.mt-l2023002
Yuta Saito, Hideo Takizawa
Yield surfaces of A5052 aluminum alloy sheets with different tempers are modeled by the simplified identification method using the circumscribing polygon. In this method, a polygon circumscribing the equal plastic work contour is determined by uniaxial tensile, equal biaxial tensile and plane strain tensile tests. Anisotropic yield surfaces of A5052 aluminum alloy sheet are modeled by Yld2000-2d (Barlat et al., 2003) and Yld2004-18p (Barlat et al., 2005) yield functions. Both yield functions can express the inscribed curves of the polygons. The modeled yield surfaces of A5052-O agree with the stress points of the equal plastic work contours measured by the reliable bi-axial tensile tests. The proposed method to identify the yield function is effective for aluminum sheet metal. On the other hand, the two identified yield functions show different in-plane plastic anisotropy in the tension-compression combined stress state. To examine the suitability of identified models, the experiments and numerical analyses of the deep drawing tests are carried out. Comparing the experimental and analyzed results, the predicted ear height of drawn cup using the Yld2004-18p yield function agree with experimental results qualitatively. But the prediction of the ear using the Yld2000-2d cannot express the tendency of the experimental one.
采用边界多边形简化识别方法，对不同回火状态下的A5052铝合金薄板屈服曲面进行了建模。在该方法中，通过单轴拉伸、等双轴拉伸和平面应变拉伸试验确定等量塑性工作轮廓的多边形。A5052铝合金薄板的各向异性屈服面采用Yld2000-2d (Barlat et al.， 2003)和Yld2004-18p (Barlat et al.， 2005)屈服函数建模。两种屈服函数都可以表示多边形的内切曲线。模拟的A5052-O屈服面与可靠的双轴拉伸试验测得的等塑性工作轮廓的应力点一致。本文提出的屈服函数识别方法对铝板的屈服函数识别是有效的。另一方面，两种屈服函数在拉压复合应力状态下表现出不同的面内塑性各向异性。为了验证所识别模型的适用性，进行了深拉深试验的实验和数值分析。将实验结果与分析结果进行比较，利用Yld2004-18p屈服函数预测的拔杯穗高与实验结果定性一致。但是利用Yld2000-2d对耳朵的预测不能表达实验的趋势。
{"title":"Modeling of Yield Surfaces for A5052 Aluminum Alloy Sheets with Different Tempers by Simplified Identification Method and Its Experimental Validation","authors":"Yuta Saito, Hideo Takizawa","doi":"10.2320/matertrans.mt-l2023002","DOIUrl":"https://doi.org/10.2320/matertrans.mt-l2023002","url":null,"abstract":"Yield surfaces of A5052 aluminum alloy sheets with different tempers are modeled by the simplified identification method using the circumscribing polygon. In this method, a polygon circumscribing the equal plastic work contour is determined by uniaxial tensile, equal biaxial tensile and plane strain tensile tests. Anisotropic yield surfaces of A5052 aluminum alloy sheet are modeled by Yld2000-2d (Barlat et al., 2003) and Yld2004-18p (Barlat et al., 2005) yield functions. Both yield functions can express the inscribed curves of the polygons. The modeled yield surfaces of A5052-O agree with the stress points of the equal plastic work contours measured by the reliable bi-axial tensile tests. The proposed method to identify the yield function is effective for aluminum sheet metal. On the other hand, the two identified yield functions show different in-plane plastic anisotropy in the tension-compression combined stress state. To examine the suitability of identified models, the experiments and numerical analyses of the deep drawing tests are carried out. Comparing the experimental and analyzed results, the predicted ear height of drawn cup using the Yld2004-18p yield function agree with experimental results qualitatively. But the prediction of the ear using the Yld2000-2d cannot express the tendency of the experimental one.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135209917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nanoscale microstructural analysis and evaluation of mechanical properties were conducted on severely cold-rolled aluminum alloys. In order to examine the effect of alloying elements on microstructure and mechanical properties, Al–Cu–Mg, Al–Mg–Si and Al–Zn–Mg–Cu alloy sheets were prepared for systematic investigation. The SAXS and SANS were used to analyze the nanoscale microstructures in solution-treated and rolled samples of Al–Cu–Mg and Al–Zn–Mg–Cu alloys, and the results quantitatively revealed that nanoscale clusters are formed regardless of with or without rolling. HR-TEM, HAADF-STEM, thermal analysis, hardness and electrical conductivity measurements also suggested that the clusters are formed in cold-rolled samples. Mechanical property evaluations showed that strength generally increased, and ductility decreased with increasing cold-rolling reduction. The strength tended to increase with increasing solute content regardless of the alloy system.
{"title":"Nanoscale Analysis of Solute Distribution in Ultrahigh-Strength Aluminum Alloys","authors":"Equo Kobayashi, Masato Ohnuma, Shigeru Kuramoto, Junya Kobayashi, Goroh Itoh","doi":"10.2320/matertrans.mt-mf2022032","DOIUrl":"https://doi.org/10.2320/matertrans.mt-mf2022032","url":null,"abstract":"Nanoscale microstructural analysis and evaluation of mechanical properties were conducted on severely cold-rolled aluminum alloys. In order to examine the effect of alloying elements on microstructure and mechanical properties, Al–Cu–Mg, Al–Mg–Si and Al–Zn–Mg–Cu alloy sheets were prepared for systematic investigation. The SAXS and SANS were used to analyze the nanoscale microstructures in solution-treated and rolled samples of Al–Cu–Mg and Al–Zn–Mg–Cu alloys, and the results quantitatively revealed that nanoscale clusters are formed regardless of with or without rolling. HR-TEM, HAADF-STEM, thermal analysis, hardness and electrical conductivity measurements also suggested that the clusters are formed in cold-rolled samples. Mechanical property evaluations showed that strength generally increased, and ductility decreased with increasing cold-rolling reduction. The strength tended to increase with increasing solute content regardless of the alloy system.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135209918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.2320/matertrans.mt-m2023003
Y. Kimura, Xiao Xu, K. Han, K. Niitsu, T. Omori, R. Umetsu, R. Kainuma
{"title":"R-Phase Transformation in Ti50−xNi47+xFe3 Shape Memory Alloys","authors":"Y. Kimura, Xiao Xu, K. Han, K. Niitsu, T. Omori, R. Umetsu, R. Kainuma","doi":"10.2320/matertrans.mt-m2023003","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023003","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47367522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：