搜索结果: 1-15 共查到“材料科学 ECAP”相关记录19条 . 查询时间(0.14 秒)
连续柱状晶Cu-ECAP中的晶界演变及其与剪切带的交互作用
连续柱状晶Cu 等通道转角挤压 晶界演变 剪切行为
2019/11/25
金属发生塑性变形时形成的剪切带在高应变状态下会被分割为孪晶-基体片层状组织,而纳米尺度的孪晶界能实现材料强塑性的高度匹配。因此,利用等通道转角挤压(ECAP)技术研究剪切带的形成与作用可为材料的强塑性匹配提供有效支持。通过对具有特殊晶界角度的连续柱状晶纯Cu进行1道次ECAP变形,研究变形过程中晶界的演变,分析变形过程中剪切带的形成机制及与晶界的交互作用,测试了不同晶界角度试样变形后的力学性能。结...
在500℃采用C方式ECAP变形制备了亚微晶45钢, 用光学显微镜(OM)、透射电子显微镜(TEM)和电子衍射(SAED)等分析技术对其进行表征, 研究了铁素体组织的演变特征和晶粒细化机制。结果表明: 在初始变形道次后, 原始的粗大铁素体晶粒因剧烈剪切变形而沿着剪切变形的方向形成剪切变形带, 在其内大量的具有亚微米尺寸的板条状位错胞或亚晶使铁素体晶粒显著细化。进一步变形使板条状位错胞或亚晶组织继续...
ECAP methods application on selected non-ferrous metals and alloys
Metallic alloys ECAP method Mechanical properties Microstructure
2010/6/2
In many technical processes of forming the deformation is substantially greater than conditions at the tensile test. In this case a torsion tests have already been used for a long time at investigatio...
Microstructure and properties of α + β brass after ECAP processing
ECAP Severe plastic deformation Ultra-fine grained materials
2010/1/11
Purpose of this paper is to determine the effect of Equal Channel Angular Pressing (ECAP) processing on the microstructure and hardness of α+β brasses. The effect of deformation temperature an...
Influence of change of direction of deformation at ECAP technology on achieved UFG in AlMn1Cu alloy
Plastic Forming ECAP process of AlMn1Cu alloy Structure analysis
2009/12/14
Purpose: of this paper is to extend a complex evaluation of aluminium alloy, which requires very often knowledge of behaviour of deformation at the ECAP process and achieved strengthening, intensity o...
Influence of severe plastic deformation by the ECAP method on structure and properties of the P2-04BCh steel
Nanomaterials Low-carbon steel ECAE deformation
2009/12/3
Purpose: Maim aim of this paper is to describe the plastic deformation executed by ECAE of low carbon steel. The ECAE method lead to significant improvement of strength of investigated material.
Desi...
Increase of efficiency of the ECAP technology at grain refinement of the alloy AlMn1Cu
ECAP process Mathematical simulation Channel geometry
2009/12/2
Purpose: The foundation of the resolved problem consists of verification of influence of temperature and also
geometry of the ECAP tool on obtaining of required amount of deformation which substantia...
Purpose: Main aim of this paper is to describe the plastic deformation executed by ECAP on low cycle fatigue
of steel AISI 316. Among others was attention fixed on mechanical properties after this tr...
Influence of ECAP technology on the metal structures and properties
Nanomaterials ECAP Microstructure Mechanical properties
2009/12/1
Purpose: The purpose of the paper is the verification of functionality of the ECAP technology at extrusion of the
copper, alluminium alloys, magnesium alloys and steel.
Design/methodology/approach: ...
Using severe plastic deformation to prepare of ultra fine - grained materials by ECAP method
Severe plastic deformation Die geometry Microstructures analyse
2009/12/1
Purpose: The purpose of the paper is to design a tool and propose a procedure for verification of development
of structure at equal channel angular pressing. The goal is to obtain after extrusion th...
ECAP变形下304L奥氏体不锈钢的形变诱导马氏体相变
奥氏体不锈钢 等通道转角挤压 亚微米晶
2009/10/15
研究了304L奥氏体不锈钢在严重塑性变形(等通道转角挤压, ECAP)下发生形变诱导马氏体转变的微观特征, 包括形核特征、长大方式和相变晶体学, 探讨了粗大晶粒和亚微米晶粒发生马氏体相变的异同和微观机理. 结果表明: 粗大奥氏体晶粒发生相变时, 马氏体主要形核于微观剪切带(包括层错、变形孪晶和ε相等)的相互交割处, 马氏体与奥氏体之间为K---S(Kurduumov---Sachs)关系, 而不是...
ECAP对纯铝拉伸性能和断裂行为影响的研究
等通道转角挤压(ECAP) 位错 断裂机制
2009/6/1
利用等通道转角挤压(ECAP)对纯铝进行了连续的挤压,结合位错及断口形貌,分析了位错强化及断裂机制.结果表明,剪切变形使位错滑移,晶粒细化,挤压4道次后材料屈服强度、抗拉强度分别较初始态提高了38.5%和24.0%,断裂机制呈现典型的沿晶断裂特征.
室温ECAP和冷轧复合变形工业纯钛的组织和性能
金属材料 ECAP 冷轧 工业纯钛
2009/2/8
采用ECAP技术和常规冷轧复合变形工艺制备了高强度工业纯钛,研究了复合变形后试样的力学性能与显微组织的关系. 结果表明,工业纯钛经室温单道次ECAP和冷轧复合变形后, 晶粒被严重拉长, 形成了明显的纤维状组织,试样的抗拉强度高达805 MPa; 随着冷轧变形量的增大, 变形组织的细化程度和均匀性提高,使试样的强度和塑性进一步提高. 位错滑移和孪生是工业纯钛室温ECAP和冷轧复合变形的主要变形机制....
使用DEFORM-3D软件模拟等通道转角挤压过程中外转角半径及背压对纯钛应力和应变分布的影响，探讨不同 R值对材料流动的影响规律。结果显示：当R = 6 mm时，工件上下表面应力状况较为平衡，从而得到均匀的等效应变分布；当R＜6 mm时，在外转角形成的死区使材料之间相互搓动，导致工件底部区域出现剧烈畸变，工件不同区域之间的等效应变量差别较大；当R＞6 mm时，工件上表面与模具内转角之间的相互作用力...
The structure of austenitic steel AISI 316 after ECAP and low-cycle fatigue
Structure Low-cycle fatigue Steel AISI 316
2008/6/30
Purpose: The article presents results of investigation of structure and properties of austenitic steel grade AISI 316 after application of Equal Channel Angular Pressing (ECAP) at the temperature of a...