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Rapid directional solidification in Sn-Cu lead-free solder
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作者 Jun Shen Yongchang Liu houxiu gao 《Journal of University of Science and Technology Beijing》 CSCD 2006年第4期333-337,共5页
An experimental study on the microstructures of a rapid directionally solidified metallo-eutectic Sn-Cu alloy was carried out. This material is an important alloy that is used as a lead-free solder. The results showed... An experimental study on the microstructures of a rapid directionally solidified metallo-eutectic Sn-Cu alloy was carried out. This material is an important alloy that is used as a lead-free solder. The results showed that the kinetic undercooling due to the rapid solidification process led to the formation of a pseudoeutectic zone, whereas the hypereutectic reaction produced the regular lamellar structure in the hypereutectic Sn-1.0Cu alloy. The corresponding arm spacing in the obtained lamellar phases decreased gradually with the increase of the applied cooling rate, which corresponded well with the prediction of a rapid directional solidification model. 展开更多
关键词 lead-free solder rapid directional solidification intermetallic compounds (IMCs) pseudoeutectic
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Observations of nonlinear oscillation phenomena in metallic solids 被引量:6
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作者 houxiu gao Yuqin Yang +1 位作者 Jingwu Yang Anwei Liu 《Chinese Science Bulletin》 SCIE EI CAS 1999年第1期54-58,共5页
A great number of in situ observations proved that at normal temperature and pressure there exists a nonlinear oscillation phenomenon in the solid alloys. This kind of oscillation phenomenon exhibits fluid-like charac... A great number of in situ observations proved that at normal temperature and pressure there exists a nonlinear oscillation phenomenon in the solid alloys. This kind of oscillation phenomenon exhibits fluid-like character in localized areas, fluctuating with crystal rotation, cell’s moving, expansion and contraction. 展开更多
关键词 solid alloy nonlinear OSCILLATION fluid CHARACTER structural fluctuation.
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