{"title":"Chapter 4 Diffusion in metals","authors":"","doi":"10.1515/9783110758023-004","DOIUrl":"https://doi.org/10.1515/9783110758023-004","url":null,"abstract":"","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"8 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74372004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Interaction Between $$ { 10bar{1}2} $$ Twinning and Long-Period Stacking Ordered (LPSO) Phase During Hot Rolling and Annealing Process of a Mg-Gd-Y-Zn-Zr Alloy","authors":"J. Shao, Zhiyong Chen, Tao Chen, Chuming Liu","doi":"10.1007/s11661-020-06094-4","DOIUrl":"https://doi.org/10.1007/s11661-020-06094-4","url":null,"abstract":"","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"45 1","pages":"520-530"},"PeriodicalIF":2.8,"publicationDate":"2021-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90758726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zeyi Guan, Chase S Linsley, Shuaihang Pan, Christina DeBenedetto, Jingke Liu, Benjamin M Wu, Xiaochun Li
{"title":"Highly Ductile Zn-2Fe-WC Nanocomposite as Biodegradable Material.","authors":"Zeyi Guan, Chase S Linsley, Shuaihang Pan, Christina DeBenedetto, Jingke Liu, Benjamin M Wu, Xiaochun Li","doi":"10.1007/s11661-020-05878-y","DOIUrl":"10.1007/s11661-020-05878-y","url":null,"abstract":"<p><p>Zinc (Zn) has been widely investigated as a biodegradable metal for orthopedic implants and vascular stents due to its ideal corrosion in vivo and biocompatibility. However, pure Zn lacks adequate mechanical properties for load-bearing applications. Alloying elements, such as iron (Fe), have been shown to improve the strength significantly, but at the cost of compromised ductility and corrosion rate. In this study, tungsten carbide (WC) nanoparticles were incorporated into the Zn-2Fe alloy system for strengthening, microstructure modification, and ductility enhancement. Thermally stable WC nanoparticles modified the intermetallic ζ-FeZn<sub>13</sub> interface morphology from faceted to non-faceted. Consequently, WC nanoparticles simultaneously enhance mechanical strength and ductility while maintaining a reasonable corrosion rate. Overall, this novel Zn-Fe-WC nanocomposite could be used as biodegradable material for biomedical applications where pure Zn is inadequate.</p>","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"51 9","pages":"4406-4413"},"PeriodicalIF":2.8,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s11661-020-05878-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39123387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Nitrogen Effects in Additively Manufactured Martensitic Stainless Steels: Conventional Thermal Processing and Comparison with Wrought.","authors":"Eric A Lass, Fan Zhang, Carelyn E Campbell","doi":"10.1007/s11661-020-05703-6","DOIUrl":"https://doi.org/10.1007/s11661-020-05703-6","url":null,"abstract":"<p><p>The microstructures of additively manufactured (AM) precipitation-hardenable stainless steels 17-4 and 15-5 were investigated and compared to those of conventionally produced materials. The residual N found in N<sub>2</sub>-atomized 17-4 powder feedstock is inherited by the additively produced material, and has dramatic effects on phase stability, microstructure, and microstructural evolution. Nitrogen is a known austenite stabilizing element, and the as-built microstructure of AM 17-4 can contain up to 90 pct or more retained austenite, compared to the nearly 100 pct martensite structure of wrought 17-4. Even after homogenization and solutionization heat treatments, AM 17-4 contains 5 to 20 pct retained austenite. In contrast, AM 15-5 and Ar-atomized AM 17-4 contain<5 pct retained austenite in the as-built condition, and this level is further decreased following post-build thermal processing. Computational thermodynamics-based calculations qualitatively describe the observed depression in the martensite start temperature and martensite stability as a function of N-content, but require further refinements to become quantitative. A significant increase in the volume fraction of fine-scale carbide precipitates attributed to the high N-content of AM 17-4 is also hypothesized to give rise to additional activation barriers for the dislocation motion required for martensite nucleation and subsequent growth. An increase in the volume fraction of carbide/nitride precipitates is observed in AM 15-5, although they do not inhibit martensite formation to the extent observed in AM 17-4.</p>","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"51 5","pages":""},"PeriodicalIF":2.8,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s11661-020-05703-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9383831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W J Boettinger, D E Newbury, N W M Ritchie, M E Williams, U R Kattner, E A Lass, K-W Moon, M B Katz, J H Perepezko
{"title":"Solidification of Ni-Re Peritectic Alloys.","authors":"W J Boettinger, D E Newbury, N W M Ritchie, M E Williams, U R Kattner, E A Lass, K-W Moon, M B Katz, J H Perepezko","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Differential thermal analysis (DTA) and microstructural and microprobe measurements of DTA and as-cast Ni-Re alloys with compositions between 0.20 and 0.44 mass fraction Re provide information to resolve differences in previously published Ni-Re phase diagrams. This investigation determines that the peritectic invariant between liquid, Re-rich hexagonal close packed and Ni-rich face center cubic phases, L + HCP → FCC, occurs at 1561.1 °C ± 3.4 °C (1<i>σ</i>) with compositions of liquid, FCC and HCP phases of 0.283 ± 0.036, 0.436 ± 0.026, and 0.828 ± 0.037 mass fraction Re, respectively. Analysis of the microsegregation in FCC alloys yields a partition coefficient for solidification, <i>k</i> = 1.54 ± 0.09 (mass frac./mass frac.). A small deviation from Scheil behavior due to dendrite tip kinetics is documented in as-cast samples. No evidence of an intermetallic phase is observed.</p>","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"50 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7552818/pdf/nihms-1616217.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38493758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G Lindwall, C E Campbell, E A Lass, F Zhang, M R Stoudt, A J Allen, L E Levine
{"title":"Simulation of TTT Curves for Additively Manufactured Inconel 625.","authors":"G Lindwall, C E Campbell, E A Lass, F Zhang, M R Stoudt, A J Allen, L E Levine","doi":"10.1007/s11661-018-4959-7","DOIUrl":"10.1007/s11661-018-4959-7","url":null,"abstract":"<p><p>The ability to use common computational thermodynamic and kinetic tools to study the microstructure evolution in Inconel 625 (IN625) manufactured using the additive manufacturing (AM) technique of laser powder-bed fusion is evaluated. Solidification simulations indicate that laser melting and re-melting during printing produce highly segregated interdendritic regions. Precipitation simulations for different degrees of segregation show that the larger the segregation, i.e., the richer the interdendritic regions are in Nb and Mo, the faster the <i>δ</i>-phase (Ni<sub>3</sub>Nb) precipitation. This is in accordance with the accelerated d precipitation observed experimentally during post-build heat treatments of AM IN625 compared to wrought IN625. The <i>δ</i>-phase may be undesirable since it can lead to detrimental effects on the mechanical properties. The results are presented in the form of a TTT diagram and agreement between the simulated diagram and the experimental TTT diagram demonstrate how these computational tools can be used to guide and optimize post-build treatments of AM materials.</p>","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"50 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9706688/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40712938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}