study on the influence of die structure on ultrafine grain

Grain boundary financial definition of Grain boundary

Effect of Deformation Structure and Annealing Temperature on Corrosion of Ultrafine-Grain Fe-Cr Alloy Prepared by Equal Channel Angular Pressing The vast majority of the austenite grains are distinct and the grain boundary can be obtained clearly (the black lines on behalf of the grain boundary ).

Defect Structure in Nanomaterials

5.1 Effect of grain size on deformation mechanisms in fcc and hcp nanomaterials 5.2 Breakdown of Hall-Petch behaviour in nanomaterials 5.3 Correlation between dislocation structure and yield strength of ultrafine-grained fcc metals and alloys processed by 5.4

Microstructure and Corrosion Behavior of the Friction Stir Welded Joints Made from Ultrafine

2 ECAP (I-ECAP) was used in1 order to achieve ultrafine grained structure. Samples in the initial 2 state, after four and eight passes of I-ECAP process were joined with similar plates using Friction 3 Stir Welding (FSW). Initially refined microstructure after I-ECAP

Influence of scan strategy and process parameters on microstructure

ultrafine TiC particle reinforced IN625 composite parts and study the effects of laser energy input per unit length on the resultant microstructures. Amato et al. [1]investigatethemi-crostructuresonL-PBFandEB-PBFprocessedIN625nickel-based alloy parts and

Influence of Grain Size and Texture on the Yield Strength

Severe plastic deformation (SPD) has been widely employed to refine the grain size of Mg alloys, with the main objective to improve the strength and ductility of Mg alloys, since the well-known Hall-Petch equation suggests that a decreased grain size leads to an increased yield strength. However, the yield strength of Mg alloys processed by SPD is often decreased even though the grain size is

INHOMOGENEOUS AND ANISOTROPIC DEFORMATION BEHAVIOR AND STRAIN HARDENING OF ULTRAFINE

structure. Both the dislocations in the grain interior and the decrease in grain size cause the increase in flow stress. Also the effect of annealing is clear: the grain structure becomes free of dislocations, allowing again a normal strain hardening behavior. In

PAPER OPEN ACCESS Study on the Influence of Die structure on

Study on the Influence of Die structure on Ultrafine Grain Materials To cite this article: Shiqian Cui 2019 IOP Conf. Ser.: Mater. Sci. Eng. 493 012127 View the article online for updates and enhancements. This content was downloaded from IP address 207.46

PAPER OPEN ACCESS The increased stability of a coarse

In order to form ultrafine-grained structure, quenched TiNi samples with a cylinder shape (20 mm, 100 mm long) are subjected to 8 equal cannel angular pressure (ECAP) cycles on a die-set with the angle of channels intersection of 120 at 450 С.

Effect of Grain Size on Superplastic Deformation of

2018/12/4The superplastic deformation exhibited by metals with different grain sizes and their corresponding deformation mechanism influences the industrial metal-forming processes. The coarse-grained materials, which contain grain size greater than 20 μm, exhibited superplastic deformation at high homologous temperature and low strain rate of the order of 10−4 s−1. Fine grain materials (1–20

Formation of Serrated Grain Boundaries and Their Effect on the

grain structure is limited to about 650 C. However, in the quest for higher service tempera- tures where time dependent phenomena start playing a predominant role, it is necessary to in- crease the grain size of the material. In addition, the increase in

Mechanical Behavior of an Ultrafine/Nano Grained Magnesium Alloy

Mechanical Behavior of an Ultrafine/Nano Grained Magnesium Alloy Seyed Mahmood Fatemi*,1, Abbas Zarei-Hanzaki2 1School of Mechanical Engineering, Shahid Rajaee Teacher Training University, 136-16785, Tehran, Iran. 2Department of Metallurgical Materials Engineering, University of Tehran, 515-14395, Tehran, Iran.

Effect of second

2019/9/11Reset your password If you have a user account, you will need to reset your password the next time you login. You will only need to do this once.Department of Advanced Materials, World Tech Scientific Research Center (WT-SRC), Tehran, Iran 1 Current address: Department of Applied Science and Technology, Turin Polytechnic, Corso Duca Degli Abruzzi 24, 10129 Turin, Italy.

Grain Size and Its Influence on Materials Properties

Grain Size and Its Influence on Materials Properties 20 August 2005 – IndustrialHeating Fig. 1 Ferrite grain structure of a lamination steel; 2%nital etch. Fig. 2 Austenite grains with annelaing twins in AISI Type 316 stainless steel; Kalling's number 2 etch.

Study on the Influence of Die structure on Ultrafine Grain

2019/3/1Ultrafine crystal materials have excellent mechanical properties and mechanical properties, the preparation of ultrafine crystal materials has been highly valued in actual production and life. Severe plastic Deformation (SPD) method is a newly developed method for the preparation of superfine crystal materials. Groove pressing (GP) method is a kind of SPD method. Compared with other methods

Study on Effect of Ultrafine Grain Refinement on Mechanical

Study on Effect of Ultrafine Grain Refinement on Mechanical Properties of Non-Heat Treatable Alloys Mr. Harshal Panditrao Jadhav Prof. V.C. Kale Department of Mechanical Engineering Department of Mechanical Engineering Nasik, IndiaNasik, India Abstract- Among the procedure devised for grain

Deformation mechanisms and plasticity of ultrafine

Bulk ultrafine-grained (UFG) metals with grain sizes smaller than 1 μm made via severe plastic deformation typically have high strength but very low tensile ductility at ambient temperatures [1,2,3,4,5,6,7]. This is not surprising because they are derived from

The influence of texture on the elastic properties of

1998/2/1The connection between texture and elastic behavior of ultrafine-grain (250 nm) copper produced by severe plastic deformation is investigated. A previous study indicated that as-processed ultrafine-grain copper has a low elastic modulus (E=115 GPa) which recovers the accepted value (128 GPa) after annealing above 150–200 C.. It was proposed that the low modulus was the result of non

Microstructure and mechanical properties of friction stir

Microstructure and mechanical properties of friction stir welded joints made from ultrafine grained aluminium 1050 Marta Lipińska1*, Lech Olejnik2, Adam Pietras3, Andrzej Rosochowski 4, Piotr Bazarnik 1, Jacek Goliński 2, Tomasz Brynk1 and Małgorzata Lewandowska1

Effect of Chemical Composition on Structure and

Although a large number of high-angle grain boundaries exist in the ECAP structure, the significant fraction of low-angle boundaries is also apparent. The extinction contours perpendicular to the grain boundaries indicate the presence of strong elastic stresses in the grain interior, which most likely have been produced by severely distorted grain boundaries.

Deformation mechanisms and plasticity of ultrafine

1 Introduction Bulk ultrafine-grained (UFG) metals with grain sizes smaller than 1 μm made via severe plastic deformation typically have high strength but very low tensile ductility at ambient temperatures [1,2,3,4,5,6,7].This is not surprising because they are derived

Effect of Grain Size on Superplastic Deformation of

2018/12/4The superplastic deformation exhibited by metals with different grain sizes and their corresponding deformation mechanism influences the industrial metal-forming processes. The coarse-grained materials, which contain grain size greater than 20 μm, exhibited superplastic deformation at high homologous temperature and low strain rate of the order of 10−4 s−1. Fine grain materials (1–20

Equal Channel Angular Extrusion Characteristics on

2017/6/21This study focused on the review of major mechanical properties of aluminum alloys in the presence of an ultrafine grain size into polycrystalline materials by subjecting the metal to an intense plastic straining through simple shear without any corresponding The

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