Role of Impurities in Superplastic Flow and Cavitation

杂质在超塑性流动和空化中的作用

基本信息

  • 批准号:
    9500316
  • 负责人:
  • 金额:
    $ 37.07万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    1995
  • 资助国家:
    美国
  • 起止时间:
    1995-08-15 至 1999-03-31
  • 项目状态:
    已结题

项目摘要

9500316 Mohamed This is a fundamental investigation of superplastic flow and cavitation in fine-grained materials. The main objective is to assess if the characteristics of superplastic flow at low stresses are a consequence of impurity atom segregation at boundaries and to address several issues regarding the substructure details and origin of superplastic deformation and cavitation at intermediate stresses. The experimental approach involves: (a) an in-depth study of impurity type and level on the cavitation processes; (b) a characterization of impurity distribution at boundaries before and after deformation; (c) an investigation of microstructural details associated with superplastic deformation (boundary sliding and migration, grain shape, grain rotation, ligaments, and lattice dislocations) as a function of impurity level and type, strain, and deformation, mode (tension and double shear); and (d) an examination of the effects on creep behavior and microstructure of introducing oxide dispersoids into a superplastic alloy using the new process of Reactive Atomization and Deposition. Three different model materials, Zn-22%Al, Pb-62%Sn, and Al-33%Cu, are used with controlled amounts of impurities. %%% This project will not only enhance the understanding of the role of impurity atoms in the deformation and fracture of superplastic alloys, but also provide new insights into the origin of deformation processes controlling superplastic flow. ***
9500316 Mohamed这是对细晶材料中超塑性流动和空化的基础性研究。主要目的是评估在低应力下的超塑性流动特征是否是杂质原子在边界上偏析的结果,并解决有关在中等应力下超塑性变形和空化的子结构细节和起源的几个问题。实验方法包括:(a)对空化过程的杂质类型和水平进行深入研究;(b)变形前后边界杂质分布特征;(c)与超塑性变形(边界滑动和迁移、晶粒形状、晶粒旋转、韧带和晶格位错)相关的微观结构细节的研究,作为杂质水平和类型、应变和变形、模式(张力和双剪切)的函数;(d)研究了使用反应雾化和沉积新工艺将氧化物分散体引入超塑性合金对蠕变行为和微观结构的影响。使用三种不同的模型材料,Zn-22%Al, Pb-62%Sn和Al-33%Cu,并控制杂质量。该项目不仅将加深对杂质原子在超塑性合金变形和断裂中的作用的认识,而且还将为控制超塑性流动的变形过程的起源提供新的见解。***

项目成果

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Farghalli Mohamed其他文献

The Effect of ceramic reinforcements during spray atomization and codeposition of metal matrix composites: part i. heat transfer
The Effect of ceramic reinforcements during spray atomization and codeposition of metal matrix composites: Part II. Solid-state cooling effects

Farghalli Mohamed的其他文献

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{{ truncateString('Farghalli Mohamed', 18)}}的其他基金

Investigation of Creep Behavior and Microstructure in Nanocrystalline Materials
纳米晶材料蠕变行为和微观结构的研究
  • 批准号:
    0702978
  • 财政年份:
    2007
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
NIRT: Mechanical Behavior of Bulk Nanostructured Materials
NIRT:块体纳米结构材料的机械行为
  • 批准号:
    0304629
  • 财政年份:
    2003
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
The Role of Impurities in Superplastic Deformation and Cavitation
杂质在超塑性变形和空化中的作用
  • 批准号:
    9810422
  • 财政年份:
    1998
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
Effect of Impurities on Superplastic Flow and Cavitation
杂质对超塑性流动和空化的影响
  • 批准号:
    9024255
  • 财政年份:
    1991
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
Superplastic Flow at Low Stresses (Materials Research)
低应力下的超塑性流动(材料研究)
  • 批准号:
    8420615
  • 财政年份:
    1985
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
Creep Behavior Under Very Low Stresses
极低应力下的蠕变行为
  • 批准号:
    8025820
  • 财政年份:
    1980
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
Creep Behavior Under Very Low Stresses
极低应力下的蠕变行为
  • 批准号:
    8005976
  • 财政年份:
    1980
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Continuing Grant
Creep Behavior Under Very Low Stresses
极低应力下的蠕变行为
  • 批准号:
    7727619
  • 财政年份:
    1978
  • 资助金额:
    $ 37.07万
  • 项目类别:
    Standard Grant

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