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强变形过程中铁镍合金的微观结构演化机制 总被引:1,自引:0,他引:1
采用透射电镜观察了铁镍(Fe 32%Ni)合金在形变温度500 ℃(<05Tm)、形变速率10-2 s-1的变形条件下多轴锻造变形过程中的微观结构演变。结果表明,低温多轴锻造强变形可明显细化晶粒,细化过程为:首先,位错墙、位错缠绕等结构通过大量位错滑移运动在原始晶粒内形成;其次,不同方向的变形导致不同方向的滑移系开动,从而致使不同方向的位错墙互相交叉,将原始粗晶粒细分成小尺寸的胞块结构,当变形量达到一定程度时,位错墙和位错缠绕结构内的位错开始重新排列,形成小角度晶界,导致亚晶粒形成;由于变形量不断增加强迫大量的位错在亚晶界处积聚、重排,同时不同方向的变形造成亚晶发生转动,位错重新规则排列及亚晶转动使小角度的亚晶界转变为大角度晶界,从而形成细小的新晶粒。 相似文献
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Synchrotron Radiation Lithography and MEMS Technique at NSRL 总被引:1,自引:1,他引:0
1 Introduction TheSRLincludessoftX -raylithographyanddeepX -raylithography .ThesoftX -raylithog raphyisaimedatfabricatingthesub -micronmi crostructureforthefabricationofquantumdevicesandthereplicationofdeeplithographymask .Thedeeplithographyisusedtofabrica… 相似文献
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根据热作模具钢的服役条件,基于均匀设计试验方法,设计了6种不同成分的热作模具钢,同时设计了对应的热处理工艺。测定了这6种钢的室温冲击韧性和二次回火后的硬度,提出了硬韧性因子(HT),并利用二次型逐步回归分析方法得到了硬韧性因子与化学成分及热处理工艺之间的关系。 相似文献
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Grigorenko Elena L.; Jarvin Linda; Diffley Ray III; Goodyear Julie; Shanahan Edward J.; Sternberg Robert J. 《Canadian Metallurgical Quarterly》2009,101(4):964
Two studies were carried out to predict academic success in the highly competitive environment of a private preparatory school, Choate Rosemary Hall. The 1st study focused on the question of whether there are indicators beyond middle school grade-point average (GPA) and standardized test scores that might enhance the validity of measures for predicting success of students attending Choate. The results indicated the importance of taking into account aspects of self-regulated learning (SRL), such as academic self-efficacy, academic motivation, academic locus of control, and measures of the WICS (Wisdom, Intelligence, Creativity Synthesized) theoretical framework. Both sets of SRL and WICS indicators demonstrated incremental validity in predicting success at Choate. The 2nd study preliminarily evaluated the value of including indicators of aspects of the SRL and the WICS theoretical framework into the Choate admission process. The results of this study examined the utility of using quantified indicators other than middle-school GPA and standardized test scores for making admission decisions. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Romulo Magnaye Brian Sauser Peerasit Patanakul David Nowicki Wesley Randall 《International Journal of Project Management》2014
How should the development of a complex product system (CPS) be managed in a manner that focuses on process milestones, which is responsive to changes in technology and requirements; based on maturity measures; and applied in an interactive manner, in addition to facilitating timely feedback? This is considered to be an important question in project management. Project management tools and techniques have been inadequate for monitoring technology development in a CPS. If the technologies are not properly matured by a specific period of time, the progress of the project can be in detriment. To address this important gap, the objective of this study is to develop a new maturity-focused methodology for scheduling, monitoring and evaluating the development of a system. We present Earned Readiness Management (ERM) for system scheduling, monitoring and evaluation which was developed and validated using a case study. Future research on ERM is also discussed in this paper. 相似文献
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