• cyclic behavior of extruded magnesium: experimental, microstructural and numerical approach

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 674
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the present study aims at determining the influence of cyclic straining on the behavior of pure extruded magnesium. for this purpose, tensile, compressive and cyclic tests are performed (small plastic strains are applied (δεp/2 = 0.1% and 0.4%). deformation mechanisms (slip and twin systems) have been observed by tem and the different critical resolved shear stress (crss) have been determined. based on microscopic observations, a crystal-plasticity-based constitutive model has been developed. the asymmetry between tensile and compressive loadings mainly results from the activation of hard slip systems in tension (such as 〈a〉 pyramidal and prismatic and 〈c + a〉 pyramidal glides) and twinning in compression. it is shown that basal slip is very easy to activate even for small schmid factors. numerical simulations reveal that untwinning in tension subsequent to compression must be considered to correctly fit the experimental s-shaped hysteresis curves. tem observations indicate also intense secondary slips or twins inside the mother twins under cyclic conditions, so that twinning in compression and dislocation glide in tension are affected by cycling. the polycrystalline model allows to predict slip activities and twin volume fraction evolutions.

سوال خود را در مورد این مقاله مطرح نمایید :

با انتخاب دکمه ثبت پرسش، موافقت خود را با قوانین انتشار محتوا در وبسایت تی پی بین اعلام می کنم
مقالات جدیدترین رویدادها
مقالات جدیدترین ژورنال ها