The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Reza Abbaschian - One of the best experts on this subject based on the ideXlab platform.
-
In-Situ processIng of NiAl–alumIna composites by thermite reaction
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000Co-Authors: H.x. Zhu, Reza AbbaschianAbstract:Abstract NiAl–AlumIna composites have been fabricated by reactive sInterIng of ball-milled and compacted powder mixtures contaInIng NiO and Al. Dense NiAl–Al 2 O 3 composite with an InterpenetratIng Al 2 O 3 network was fabricated after 2 h of vacuum hot pressIng at 1200°C and 50 MPa. The thermite reaction mechanism, as well as phase and microstructural development of the composites, were Investigated by quenchIng the compacts from different temperatures durIng vacuum hot press. It was found that different Intermediate phases are formed dependIng on the temperatures; Ni formed first at around 600°C, followed by NiAl 3 , Ni 2 Al 3 and NiAl as temperature Increased. The formation of Al 2 O 3 phases durIng reactive hot press is believed to be a three-stage process. Initially, a small amount of Al 2 O 3 was produced by the reduction of NiO with solid Al. As temperature Increases, Al 2 O 3 particles forms by the reduction of NiO with liquid Al. FInally, a NiO/Ni/Al 2 O 3 /Ni m Al n layer structure forms via solid state displacement reaction between NiO and nickel-alumInides (NiAl 3 , Ni 2 Al 3 , NiAl) leadIng to the formation of InterpenetratIng Al 2 O 3 network In the fInal product.
-
In-Situ processIng of NiAl–alumIna composites by thermite reaction
Materials Science and Engineering: A, 2000Co-Authors: H.x. Zhu, Reza AbbaschianAbstract:Materials Science & EngIneerIng A 282 (2000) 1-7. doi:10.1016/S0921-5093(99)00788-1Received by publisher: 1999-09-25Harvest Date: 2016-01-04 12:22:59DOI: 10.1016/S0921-5093(99)00788-1Page Range: 1-
H.x. Zhu - One of the best experts on this subject based on the ideXlab platform.
-
In-Situ processIng of NiAl–alumIna composites by thermite reaction
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000Co-Authors: H.x. Zhu, Reza AbbaschianAbstract:Abstract NiAl–AlumIna composites have been fabricated by reactive sInterIng of ball-milled and compacted powder mixtures contaInIng NiO and Al. Dense NiAl–Al 2 O 3 composite with an InterpenetratIng Al 2 O 3 network was fabricated after 2 h of vacuum hot pressIng at 1200°C and 50 MPa. The thermite reaction mechanism, as well as phase and microstructural development of the composites, were Investigated by quenchIng the compacts from different temperatures durIng vacuum hot press. It was found that different Intermediate phases are formed dependIng on the temperatures; Ni formed first at around 600°C, followed by NiAl 3 , Ni 2 Al 3 and NiAl as temperature Increased. The formation of Al 2 O 3 phases durIng reactive hot press is believed to be a three-stage process. Initially, a small amount of Al 2 O 3 was produced by the reduction of NiO with solid Al. As temperature Increases, Al 2 O 3 particles forms by the reduction of NiO with liquid Al. FInally, a NiO/Ni/Al 2 O 3 /Ni m Al n layer structure forms via solid state displacement reaction between NiO and nickel-alumInides (NiAl 3 , Ni 2 Al 3 , NiAl) leadIng to the formation of InterpenetratIng Al 2 O 3 network In the fInal product.
-
In-Situ processIng of NiAl–alumIna composites by thermite reaction
Materials Science and Engineering: A, 2000Co-Authors: H.x. Zhu, Reza AbbaschianAbstract:Materials Science & EngIneerIng A 282 (2000) 1-7. doi:10.1016/S0921-5093(99)00788-1Received by publisher: 1999-09-25Harvest Date: 2016-01-04 12:22:59DOI: 10.1016/S0921-5093(99)00788-1Page Range: 1-
Ramon Antonio Rodriges Zalipynis - One of the best experts on this subject based on the ideXlab platform.
-
Ershov Informatics Conference - Distributed In Situ ProcessIng of Big Raster Data In the Cloud
Lecture Notes in Computer Science, 2018Co-Authors: Ramon Antonio Rodriges ZalipynisAbstract:A raster is the primary data type In Earth science, geology, remote sensIng and other fields with tremendous growth of data volumes. An array DBMS is an option to tackle big raster data processIng. However, raster data are traditionally stored In files, not In databases. Command lIne tools have long beIng developed to process raster files. Most tools are feature-rich and free but optimized for a sIngle machIne. This paper proposes new techniques for distributed processIng of raster data directly In diverse file formats by delegatIng considerable portions of work to such tools. An N-dimensional array data model is proposed to maIntaIn Independence from the files and the tools. Also, a new scheme named GROUP–APPLY–FInALLY is presented to universally express the majority of raster data processIng operations and streamlIne their distributed execution. New approaches make it possible to provide a rich collection of raster operations at scale and outperform SciDB over \(410\times \) on average on climate reanalysis data. SciDB is the only freely available distributed array DBMS to date. Experiments were carried out on 8- and 16-node clusters In Microsoft Azure Cloud.
-
distributed In Situ processIng of big raster data In the cloud
International Andrei Ershov Memorial Conference on Perspectives of System Informatics, 2017Co-Authors: Ramon Antonio Rodriges ZalipynisAbstract:A raster is the primary data type In Earth science, geology, remote sensIng and other fields with tremendous growth of data volumes. An array DBMS is an option to tackle big raster data processIng. However, raster data are traditionally stored In files, not In databases. Command lIne tools have long beIng developed to process raster files. Most tools are feature-rich and free but optimized for a sIngle machIne. This paper proposes new techniques for distributed processIng of raster data directly In diverse file formats by delegatIng considerable portions of work to such tools. An N-dimensional array data model is proposed to maIntaIn Independence from the files and the tools. Also, a new scheme named GROUP–APPLY–FInALLY is presented to universally express the majority of raster data processIng operations and streamlIne their distributed execution. New approaches make it possible to provide a rich collection of raster operations at scale and outperform SciDB over \(410\times \) on average on climate reanalysis data. SciDB is the only freely available distributed array DBMS to date. Experiments were carried out on 8- and 16-node clusters In Microsoft Azure Cloud.
M S Liu - One of the best experts on this subject based on the ideXlab platform.
-
preparation and properties of tib2 nanoparticle reInforced copper matrix composites by In Situ processIng
Materials Letters, 2002Co-Authors: N Y Wang, Yulong Yang, Fu Liu, Xinyu Zhang, M S LiuAbstract:Abstract A copper matrix composite reInforced by In Situ TiB 2 nanoparticle was prepared by reactions of B 2 O 3 , carbon and titanium In copper–titanium melt. The microstructure and mechanical and electrical properties of the as-drawn In Situ composite were Investigated. The results showed that the In Situ-formed TiB 2 particles, which had a size of about 50 nm, exhibited a homogenous dispersion In the copper matrix. Due to their reInforcement, the tensile strength and hardness of the In Situ Cu–TiB 2 composite significantly improved. Moreover, the as-drawn In Situ composite had a high electrical conductivity.
B. S. Murty - One of the best experts on this subject based on the ideXlab platform.
-
AlumInum-Based Cast In Situ Composites: A Review
Journal of Materials Engineering and Performance, 2015Co-Authors: S. L. Pramod, Srinivasa R. Bakshi, B. S. MurtyAbstract:In Situ composites are a class of composite materials In which the reInforcement is formed withIn the matrix by reaction durIng the processIng. In Situ method of composite synthesis has been widely followed by researchers because of several advantages over conventional stir castIng such as fIne particle size, clean Interface, and good wettability of the reInforcement with the matrix and homogeneous distribution of the reInforcement compared to other processes. Besides this, In Situ processIng of composites by castIng route is also economical and amenable for large scale production as compared to other methods such as powder metallurgy and spray formIng. Commonly used reInforcements for Al and its alloys which can be produced In Situ are Al_2O_3, AlN, TiB_2, TiC, ZrB_2, and Mg_2Si. The aim of this paper is to review the current research and development In alumInum-based In Situ composites by castIng route.
