کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7881075 | 1509596 | 2014 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructural evolution of precipitation-hardened β-type titanium alloy through high-pressure torsion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In order to elucidate the microstructural refinement mechanism and the effect of secondary phase on the microstructural evolution of β-type titanium alloy, severe plastic deformation was conducted on samples of a precipitation-hardened Ti-29Nb-13Ta-4.6Zr (TNTZ). Specifically, TNTZ that was precipitation-hardened through an aging treatment (TNTZAT) was subjected to high-pressure torsion (HPT) processing (TNTZAHPT). The microstructure of TNTZAHPT, which has been evaluated as a function of the torsional rotation number, N, exhibits ultrafine elongated β grains. The needle-like α precipitates in TNTZAT, which exhibit a diameter of approximately 12 nm, are homogeneously distributed within the β grains. The dislocation density and subgrain diameter, estimated by X-ray line profile analysis, saturate at approximately 4.2 Ã 1016 mâ2 and 12.2 nm, respectively, at N ⩾ 10. The β grains contain nanostructured subgrains having non-uniform morphologies surrounded by blurred and wavy boundaries. A saturated hardness distribution at approximately 450 HV indicates that microstructural homogeneity has been achieved at N ⩾ 10. The α precipitates enhance the β grain refinement and microstructural homogeneity is achieved in TNTZAHPT at N ⩾ 10, whereas this occurs at later stages (N > 20) in TNTZ which is solution-treated and therefore does not contain any α precipitates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 80, November 2014, Pages 172-182
Journal: Acta Materialia - Volume 80, November 2014, Pages 172-182
نویسندگان
H. Yilmazer, M. Niinomi, K. Cho, M. Nakai, J. Hieda, S. Sato, Y. Todaka,