Isothermal and constant-strain-rate compression experiments for S280 ultra-high-strength stainless steel were carried out under deformation temperatures of 1000–1150 °C strain rates 0.001–10 s?1 with a Thermecmaster-Z thermal simulator. The flow–stress behavior the alloy was studied hot activation energy calculated. A critical model dynamic recrystallization (DRX) established using work hardeni...

Grafeno é uma monocamada com estrutura hexagonal de átomos carbono e que tem se tornado um material grande interesse para os pesquisadores da nanotecnologia nanociência. Neste artigo foi analisada a viabilidade aplicação do grafeno tanto oxidado como reduzido uso eletrodo em capacitores eletroquímicos. A síntese óxido obtida através método modificado Hummels-Hofmann posteriormente redução quími...

In this study, hot deformation behavior of lean duplex stainless steel 2101 (LDX2101) is investigated via isothermal compressive tests in the temperature ranges 900–1150°C and strain rate 0.01–10 s−1. The effect on workability, partitioning flow behaviour LDX2101 systematically investigated. It found that peak stress decreased with an increase a decrease rate. softening mechanism ferrite austen...

LEI, HONGYAN. Performance analysis of power management in WLAN and UMTS. (Under the direction of Professor Arne A. Nilsson). Wireless networks have enjoyed the exponential development, and wireless communication has become an essential part of modern life. Many new wireless applications demand higher speed and consume more energy. However, wireless devices are always powered by batteries, which...

Aleados de Mg conteniendo 20% y 40% masa Ti (Mg20Ti) (Mg40Ti), han sido sintetizados por aleación mecánica caracterizados mediante difracción rayos-X (DRX) microscopia electrónica barrido (MEB con EDS) Los estudios DRX sugieren la incorporación en fase Mg, luego 40 horas molienda se aprecia aparición dos reflexiones identificadas como óxidos Mg-Ti. El oxígeno incorpora al proceso síntesis debid...

The characteristics of dynamic recrystallization (DRX) a CoCrFeMnNi high–entropy alloy (HEA) was investigated via hot compression testing in the temperature range 950–1100 °C and at true strain rates 10?2 10?1 s?1. discontinuous DRX found to be dominant mechanism corroborating microstructural evolution. progress initiation terms critical strain/stress required using Poliak–Jonas analytical crit...

Escapolita compreende uma série isomorfa de minerais aluminossicatos cálcio e sódio, tendo como membros extremos Marialita (Ma) - Na4Al3Si9O24Cl Meionita (Me) Ca4Al6Si6O24CO3, com variedades minerais-gemas. No estado do Espírito Santo, foi registrado ocorrências escapolitas prismáticas, amareladas, boa transparência. Este estudo tem o objetivo caracterizar as dos depósitos Aracruz Nova Venécia ...

In contrast to practical hot compression processes, the testing of workability TiAl alloys is usually conducted under conditions constant strain rates and temperatures. This work aims at investigating microstructural evolution on a Gleeble-3800 thermomechanical simulator variable rate (0.1, 0.01 0.001 s−1) 1200 °C. The results show that, after holding time 30 s, abrupt change in ε = 0.3 (engine...