Study of Ambient Temperature Compression Creep Deformation Behavior of Alpha Titanium Alloy PDF Download

Author: Carl Andrew Hultgren
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Category :
Languages : en
Pages : 230

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Author: Charles Arthur Greene
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Category : Titanium alloys
Languages : en
Pages : 392

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Systematic studies were undertaken to determine the ambient temperature tensile and creep deformation behavior, including mechanisms, of alpha Ti-Mn, and alpha-beta and beta Ti-Mn and Ti-V alloys. In regard to the a Ti-Mn alloy, it was found that when creep tested at 95% of the 0.2% Yield Stress (YS) the creep strain of the coarse grained (500 microns) material was significantly higher than the fine grained (45 microns) material. This effect was found to be due to the scientifically interesting phenomenon of time dependent twinning in coarse grained alpha phase. Such a phenomenon has never been reported before. Based on optical and scanning electron microscopic observations of displacements of the grid lines obtained by electron lithography and transmission electron microscopic observations, it was found that there are strong slip/twin, twin/slip and twin/twin interactions during creep deformation. The tensile deformation of beta titanium alloys depended on the alloying elements. In the beta Ti-Mn alloy the tensile deformation mechanisms were found to be coarse and wavy slip whereas in the beta Ti-V alloy the deformation mechanisms were found to be coarse and wavy slip as well as twinning. This difference was attributed to the difference in stability of the beta phase. In contrast to the a Ti-Mn alloy the creep deformation in the beta Ti-Mn alloy was found to be negligibly small at a stress level of 95% YS. With respect to alpha-beta titanium alloys, for similar volume percent and morphology of phases, the tensile and creep deformation mechanisms were also found to depend on the alloying elements. In regard to the alpha-beta Ti-Mn alloy, the deformation mechanisms were found to be predominately fine slip in alpha and beta phases and occasional interface sliding.

Author: Charles Arthur Greene
Publisher:
ISBN:
Category : Titanium alloys
Languages : en
Pages : 0

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Book Description
Systematic studies were undertaken to determine the ambient temperature tensile and creep deformation behavior, including mechanisms, of alpha Ti-Mn, and alpha-beta and beta Ti-Mn and Ti-V alloys. In regard to the a Ti-Mn alloy, it was found that when creep tested at 95% of the 0.2% Yield Stress (YS) the creep strain of the coarse grained (500 microns) material was significantly higher than the fine grained (45 microns) material. This effect was found to be due to the scientifically interesting phenomenon of time dependent twinning in coarse grained alpha phase. Such a phenomenon has never been reported before. Based on optical and scanning electron microscopic observations of displacements of the grid lines obtained by electron lithography and transmission electron microscopic observations, it was found that there are strong slip/twin, twin/slip and twin/twin interactions during creep deformation. The tensile deformation of beta titanium alloys depended on the alloying elements. In the beta Ti-Mn alloy the tensile deformation mechanisms were found to be coarse and wavy slip whereas in the beta Ti-V alloy the deformation mechanisms were found to be coarse and wavy slip as well as twinning. This difference was attributed to the difference in stability of the beta phase. In contrast to the a Ti-Mn alloy the creep deformation in the beta Ti-Mn alloy was found to be negligibly small at a stress level of 95% YS. With respect to alpha-beta titanium alloys, for similar volume percent and morphology of phases, the tensile and creep deformation mechanisms were also found to depend on the alloying elements. In regard to the alpha-beta Ti-Mn alloy, the deformation mechanisms were found to be predominately fine slip in alpha and beta phases and occasional interface sliding.

Author: Matt C. Brandes
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Languages : en
Pages :

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Abstract: Titanium and it alloys are extensively utilized in critical applications that require materials with high strength to weight ratios, rigidities, and toughnesses. This being the case, over 70 years of research have been devoted to the measurement, understanding, and tailoring of the mechanical properties of these alloys. Despite these efforts, surveys of the current knowledge base and understanding of the mechanical responses of Ti alloys demonstrate that numerous mechanical behaviors have yet to be investigated and explained. It has been noted, but generally not appreciated, that commercially important materials display modest strength differentials near room temperature when deformed under quasi-static loading conditions at modest rates (~10-5 to 10-3 1/s). Under static loading, subtle variations in plastic flow behavior leads to dramatically weaker materials when loaded in tension versus compression. The asymmetric material responses of single and two-phase alloys deformed under monotonic constant rate and creep conditions have been investigated and related to the fundamental slip behavior observed in single crystalline materials. Two-phase titanium alloys containing a majority volume fraction of the alpha (HCP) phase have long been known to undergo creep deformation at lower temperatures (T

Author: Durgalakshmi Doraiswamy
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Category :
Languages : en
Pages : 244

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Author: Jeremy Victor Gluck
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Category : Metals
Languages : en
Pages : 82

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Category :
Languages : en
Pages : 17

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The beta Titanium alloy Ti-23niobium-11aluminum (at. pct.) differs from other beta Ti alloys in that it is age-hardenable due to the formation of lath-like, alpha-two precipitates based on Ti3Al. This study reports the room temperature deformation and slip behavior of the Ti-23Nb-11Al alloy as a function of heat treatment. The results indicate that the formation of the alpha-two precipitates results in not only a large increase in yield stress but also can induce a change in slip mode from inhomogeneous to uniform slip.

Author:
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Category :
Languages : en
Pages :

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Author: Jeremy V. Gluck
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Category : Metals
Languages : en
Pages : 98

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Author: Charles J. McMahon
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Category : Technology & Engineering
Languages : en
Pages : 448

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