激光選區(qū)熔化用AlSi10Mg粉末顯微組織與性能

激光選區(qū)熔化用AlSi10Mg粉末顯微組織與性能Microstructure and Properties of AlSi10Mg Powder for Selective Laser Melting

采用超音速氣體霧化制備AlSi10Mg粉末，粉末經(jīng)分級后通過激光選區(qū)熔化制成試塊。利用金相顯微鏡、掃描電子顯微鏡、X射線衍射儀研究粉末和試塊的微觀組織、組成相及演變情況，通過拉伸實(shí)驗(yàn)測試試塊的室溫拉伸性能。結(jié)果表明，AlSi10Mg粉末粒徑分布符合激光選區(qū)熔化工藝要求，粉末呈球形或類球形。粉末組織細(xì)小均勻，主要由α（Al）基體和（α+Si）共晶組成。試塊熔池形貌清晰可見，組織均勻、致密，其致密度達(dá)到99.5%；該組織中僅存在α（Al）和極少量Si相，幾乎所有合金元素均固溶于Al基體中。經(jīng)室溫拉伸性能測試，試塊的抗拉強(qiáng)度達(dá)到了442 MPa。

The AlSi10Mg powder was prepared by supersonic gas atomization. After classified, the powder was fabricated into block by selective laser melting (SLM). The microstructure, phase, and evolutions of powder and block were investigated by optical microscope, scanning electron microscope and X-Ray Diffraction. The tensile properties of SLM block were tested by tensile experiments at room temperature. The results show that the size distribution of AlSi10Mg powder after classified can meet the requirements of SLM technology. The powder always is spherical and spherical-like. Meanwhile, the microstructure of powders is fine and uniform, which contain α(Al) matrix and (α+Si) eutectic. In addition, the melt pool boundaries of SLM block are legible. The microstructure is also uniform and densified, the relative density approaches to 99.5%. On the other hand, only α(Al) and few Silicon phase are detected in this condition, due to the most alloying elements are dissolved in α(Al) matrix. At room temperature, the ultimate tensile strength of SLM block reaches up to 442 MPa.

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