کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1582108 | 1514869 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of Cu-liquid content on densification and microstructure of direct laser sintered submicron W-Cu/micron Cu powder mixture
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The direct metal laser sintering (DMLS) was used to consolidate a composite powder system consisting of submicron W-Cu powder and micron Cu powder. The influence of Cu-liquid content on densification response of direct laser sintered W-Cu components was investigated. It was found that a proper increase of Cu elemental fraction to 60Â wt.% yielded a high densification of 94.8% theoretical density, due to a favorable viscosity of liquid-solid mixture and the resultant sufficient rearrangement of W particles. However, a further increase in Cu content deteriorated laser sintered density, because of “balling” effect. The effect of Cu-liquid content on microstructural features of laser-processed components was also studied. It showed that at a suitable Cu elemental content of 60Â wt.%, a series of regularly shaped W-rim/Cu-core structures were formed after laser sintering. The metallurgical mechanisms for the formation of such a novel structure were proposed. It shows that the combined action of the thermal Marangoni flow and the solutal one, which are induced by temperature gradient and concentration differences at solid-liquid interfaces, accounts for the formation of the W-rim. The “particle pushing” effect during rapid solidification of Cu melt prevents the W-rim from merging and, thus, remains the Cu-core after solidification.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 489, Issues 1â2, 20 August 2008, Pages 169-177
Journal: Materials Science and Engineering: A - Volume 489, Issues 1â2, 20 August 2008, Pages 169-177
نویسندگان
Dongdong Gu, Yifu Shen,