کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7881838 1509604 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion
چکیده انگلیسی
Experiments were conducted to examine the evolution of microstructure and mechanical properties in a Zn-22% Al eutectoid alloy processed by high-pressure torsion (HPT). Measurements of the Vickers microhardness revealed significant weakening in the alloy after HPT, and microstructural analysis showed that the initial duplex structure, consisting of equiaxed grains and lamellae, was retained at the disk centers after HPT, whereas equiaxed fine grains were observed at the disk edges. Direct evidence is presented for a transformation of the lamellae into equiaxed very fine grains and subsequent dynamic recrystallization in the early stages of HPT. The reduction of the lamellar structure and the loss of Zn precipitates account for the weakening in the alloy in HPT processing. Excellent high strain rate superplasticity was recorded after HPT, with elongations up to ∼1800% at 473 K at a strain rate of 10−1 s−1. The experiments show that the maximum elongations are displaced to faster strain rates with increasing numbers of HPT turns.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 72, 15 June 2014, Pages 67-79
نویسندگان
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