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高M(jìn)g含量Al-Mg-Sc-Zr合金選區(qū)激光熔化成形及力學(xué)性能研究
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江蘇科技大學(xué)材料科學(xué)與工程學(xué)院

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國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(No. 2016YFB1100103)、國(guó)家自然科學(xué)(No. 51801079)江蘇省自然科學(xué)基金青年(Nos. BK20180985、BK20180987)、江蘇省高等學(xué)校自然科學(xué)研究面上項(xiàng)目(No. 18KJB430011)和鎮(zhèn)江市海洋功能薄膜材料高技術(shù)研究重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題(No. ZHZ2019001)資助


Processability and Mechanical Properties of High Mg-content Al-Mg-Sc-Zr Alloy Produced by Selective Laser Melting
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1.Jiangsu University of Science and Technology,Zhen’jiang 212003;2.China

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    摘要:

    基于寬粒徑分布粉末（2-46 μm），應(yīng)用選區(qū)激光熔化（SLM）技術(shù)制備了高M(jìn)g含量Al-14.4Mg-0.33Sc-0.19Zr鋁合金。系統(tǒng)研究了不同工藝參數(shù)和時(shí)效處理?xiàng)l件對(duì)合金SLM成形性、組織和力學(xué)性能的影響。結(jié)果表明，高激光功率可有效降低細(xì)粉飛濺對(duì)樣品成形性的干擾，SLM成形樣品的最大的相對(duì)密度為98.6%。樣品顯微組織由熔池邊界細(xì)小等軸晶和熔池內(nèi)部粗大晶粒構(gòu)成，Mg含量的增加降低了樣品織構(gòu)和柱狀晶的含量。經(jīng)不同溫度時(shí)效處理后，SLM成形樣品的硬度先增加后降低，在350 ℃時(shí)具有最大值。SLM成形樣品在350 ℃下時(shí)效處理時(shí)，硬度和壓縮屈服強(qiáng)度均隨時(shí)效時(shí)間的增加出現(xiàn)雙峰值現(xiàn)象，時(shí)效1 h后樣品的硬度和強(qiáng)度均達(dá)到最大值，分別為163±3 HV和457±10 MPa，延伸率為27±3%。樣品經(jīng)350 ℃長(zhǎng)時(shí)間時(shí)效處理后，由于第二相粒子的粗化，導(dǎo)致樣品的硬度和強(qiáng)度有所降低。本研究通過(guò)保留鋁合金粉末的細(xì)粉區(qū)，有效提升了粉末的利用率，降低了原料成本，獲得了成形性和力學(xué)性能較優(yōu)的高M(jìn)g含量SLM成形Al-Mg-Sc-Zr鋁合金。

    Abstract:

    Al-14.4Mg-0.33Sc-0.19Zr aluminium alloy with wide particle size distribution powders (2-46 μm) and high Mg-content was prepared by selective laser melting (SLM). The effects of different process parameters and aging treatment on the processability, microstructure and mechanical properties of SLM-formed Al-Mg-Sc-Zr alloy were systematically studied. Experimental results showed that the high laser power could effectively reduce the influence of fine powders splash on the processability of the samples. The maximum relative density of the sample reached 98.6%. The microstructures of the samples composed of fine equiaxed grains and coarse grains. The increase of Mg content in Al-Mg-Sc-Zr alloy reduced the texture and the content of columnar grains. The micro-hardness first increased and then decreased with the increases of aging temperatures. Both micro-hardness and compression yield strength showed dual-peak phenomenon with the increase of aging time at 350 ℃. The maximum micro-hardness ~ 163±3 HV and compressive yield strength ~ 457±10 MPa appeared for the sample ageing treatment at 350 ℃ for 1 h, with an elongation of 27±3%. After aged the samples at 350 ℃ for a long time, the micro-hardness and compressive yield strength of the sample decreased due to coarsening of the precipitated particles. In this study, the utilization ratio of the powders were efectively improved by increasing the particle size distribution of alloy powders, and SLM-formed high Mg-content Al-Mg-Sc-Zr alloy exhibited good processability and mechanical properties.

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耿遙祥,唐浩,羅金杰,許俊華,李潔,鞠洪博,喻利花,張志杰.高M(jìn)g含量Al-Mg-Sc-Zr合金選區(qū)激光熔化成形及力學(xué)性能研究[J].稀有金屬材料與工程,2021,50(3):939~947.[Geng Yaoxiang, Tang Hao, Luo Jinjie, Xu Junhua, Li Jie, Ju Hongbo, Yu Lihua, Zhang Zhjie. Processability and Mechanical Properties of High Mg-content Al-Mg-Sc-Zr Alloy Produced by Selective Laser Melting[J]. Rare Metal Materials and Engineering,2021,50(3):939~947.]
DOI：10.12442/j. issn.1002-185X.20200098

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  • 收稿日期:2020-02-19
  • 最后修改日期:2020-04-24
  • 錄用日期:2020-05-08
  • 在線發(fā)布日期: 2021-04-02
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