| 2 | IGNITING SHS BY LASER AND ITS APPLICATION TO SELECTIVE LASER SINTERING OF METALLIC POWDER MATERIAL显示文摘How to directly fabricate metallic functional parts with selective laser sintering (SLS) process is a potential technique that scientists are researching. Existent problems during directly fabricating metal part by use of SLS are analyzed. For the sake of solving the problems, a new idea of adding self-propagating high-temperature synthesis (SHS) material into metallic powder material to form new type of SLS metallic powder material is put forward. This powder material can release controllable amount of heat during its interaction with the laser beam energy to reduce the requirement to laser power during directly sintering metallic part, to prolong the time of metallic liquid phase existing, and to improve the intensity and accuracy of SLS part. For this reason, SHS material′s interaction with the CO2 laser beam energy is researched, which proves that CO2 laser beam energy may instantly ignite SHS reaction. On the basis of the above-mentioned researches, the effect of sintering the metal powder material mixing SHS material with CO2 laser is also researched, which shows: there is an optimal blending ratio of various material in the new metallic powder material. Under the optimal blending ratio and SLS process parameters, this new metallic powder material can indeed release amount of heat and SHS reaction may be controlled within the laser sintering. This research result makes it possible that the metallic part is directly sintered with small CO2 laser (less than 50W), which may greatly reduce the volume, cost and running expenditure of SLS machine, be propitious to application. | Y.S.Shi S.C.Chen X.L.Lu S.H.Huang | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，5： | 1 |
| 4 | An insight into a novel Mg2InSm prismatic plate in Mg-In-Sm alloy显示文摘Prismatic precipitate platelet is always purposefully designed in the microstructure of magnesium alloys due to its greater contribution to yield stress.In this study,with an introduction of In into Mg-Sm system,a category of novel{1010}_(α) prismatic platelets has replaced thoroughly the traditionalβ’precipitate formed in magnesium rare earth(Mg-RE)alloys.Herein,the microstructural characteristics of platelet are investigated particularly by atomic scale scanning transmission electron microscopy.It is confirmed that the platelet has a Mg_(2) InSm composition and can maintain a coherent relationship with α-Mg matrix.Importantly,on account of the similarities between In and Mg atoms,the Mg_(2) InSm prismatic platelet could be structurally categorized as a generalizedβ'precipitate with a(Mg_(2) In)Sm-type DO_(19) structure when both In and Mg are regarded as an equivalent atom.Thus,the addition of In into Mg-Sm alloy induces the formation ofβ'precipitate.Furthermore,the formedβ'prismatic platelets generally have a large average aspect ratio.The findings are of great significance to construct the effective precipitation strengthening phases and optimize the microstructure of Mg-based alloys. | J.Wang X.L.Lu Y.Tian Q.Y.Huang H.B.Xie B.Z.Sun L.R.Liu | 2022 | Journal of Materials Science & Technology2022，，30： | 0 |
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