کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10142035 | 1646089 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of cold rolling and heat-treatment on the microstructure and mechanical properties of β-titanium Ti-25Nb-25Zr alloy
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of cold rolling and heat-treatment on the microstructure and mechanical properties of β-titanium Ti-25Nb-25Zr alloy Effect of cold rolling and heat-treatment on the microstructure and mechanical properties of β-titanium Ti-25Nb-25Zr alloy](/preview/png/10142035.png)
چکیده انگلیسی
The present work describes a detailed investigation on the effect of cold deformation and subsequent heat treatment on a recently developed commercial β-type Ti-25Nb-25Zr (wt%) alloy. The β-type Ti-25Nb-25Zr alloy exhibited excellent phase stability against severe plastic deformation as well as after subsequent heat-treatments at elevated temperatures as primarily β-phase was retained. However, at low annealing temperatures, i.e. 673â¯K, a small amounts of metastable HCP-α phase precipitated, which inhibited any recrystallization and grain growth. Subsequent annealing at 873â¯K and 1073â¯K resulted in the gradual dissolution of HCP-α phase and recrystallized randomly oriented fine-grained equiaxed structure wherein average grain size increased with increasing temperature. High annealing temperatures, i.e. at 1273â¯K, resulted in extremely coarse-grained structure with preferential crystallographic orientation due to abnormal rapid grain growth. The average hardness, yield strength, and ultimate tensile strength increased whereas elongation-to-fracture, i.e. ductility, decreased after cold rolling due to strain hardening owing to large amounts of accumulated lattice defects. The retained deformed structure with α phase particles exhibited highest strength but lowest ductility. Increasing annealing temperatures from 873â¯K to 1273â¯K exhibited continuously decreasing strength values and increasing ductility due to the recrystallized structure and increasing grain size. The increasing grain size together with decreasing amounts of HCP-α phase also demonstrated a higher uniform plastic deformation and shifting of plastic instability point, i.e. UTS, towards higher strain values in the present beta Ti-25Nb-25Zr alloys.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 736, 24 October 2018, Pages 323-328
Journal: Materials Science and Engineering: A - Volume 736, 24 October 2018, Pages 323-328
نویسندگان
Sanjay Kumar Vajpai, Bhupendra Sharma, Mie Ota, Kei Ameyama,