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合金元素及孔結(jié)構(gòu)對(duì)Gasar鎂合金力學(xué)性能及腐蝕性能的影響
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清華大學(xué) 材料學(xué)院

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51771101)


Effects of alloying element and pore structure on mechanical property and corrosion properties of Gasar Mg Alloy
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School of Materials Science and Engineering,Tsinghua University

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The National Natural Science Foundation of China

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    摘要:

    采用金屬-氣體共晶定向凝固法(常稱為Gasar工藝)成功制備藕狀多孔Mg-Mn、Mg-Mn-Zn系合金,并研究合金元素及孔結(jié)構(gòu)對(duì)藕狀多孔鎂合金力學(xué)性能及腐蝕性能的影響。研究結(jié)果表明：1wt.%Mn的添加,可以使藕狀多孔純鎂的壓縮強(qiáng)度從64MPa (孔隙率~36%)提升至74MPa (孔隙率~37%),而進(jìn)一步添加1wt.%的Zn元素,材料的壓縮強(qiáng)度增至115MPa (孔隙率~37%)。Zn 元素的加入可以提高藕狀多孔 Mg-Mn合金的耐腐蝕性能,同時(shí),藕狀多孔Mg-1wt.%Mn-1wt.%Zn合金定向孔下方的圓錐狀溶質(zhì)富集區(qū)表現(xiàn)出良好的耐腐蝕性?？讖綄?duì)藕狀多孔材料腐蝕性能有一定的影響,當(dāng)孔徑尺寸為1026μm時(shí),Gasar Mg-1wt.%Mn合金孔壁腐蝕較為嚴(yán)重,而當(dāng)孔徑降至306μm時(shí),孔會(huì)被腐蝕產(chǎn)物封閉,孔壁的腐蝕程度較小。

    Abstract:

    In this paper, lotus-type porous Mg-Mn and Mg-Mn-Zn alloys were fabricated successfully by metal-gas eutectic unidirectional solidification (the Gasar method). Effects of elements on the mechanical properties and corrosion properties of porous Mg alloy was studied. The results showed that the addition of 1 wt.% Mn could increase the compressive strength of pure Mg from 64 MPa (porosity~36%) to 74 MPa (porosity~37%), and the compressive strength of the porous material could be increased to 115 MPa (porosity~37%) by adding 1 wt.% Zn to Mg- wt.% Mn alloy. Addition of Zn can effectively improve the corrosion resistance of Gasar Mg-Mn alloy. Conical solute enrichment area near the pore bottom of Gasar Mg-1wt.%Mn-1wt.%Zn alloy showed good corrosion resistance. Pore structure can affect the corrosion resistance of Gasar materials. When the average pore diameter was 1026 μ m, the corrosion of the pore wall in Mg-1wt.%Mn alloy was more serious. While the average pore diameter was decreased to 306 μ m, the pore of the samples would be blocked by corrosion products, and the corrosion of pore walls was less.

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周燦旭,劉源.合金元素及孔結(jié)構(gòu)對(duì)Gasar鎂合金力學(xué)性能及腐蝕性能的影響[J].稀有金屬材料與工程,2022,51(2):637~644.[Canxu Zhou, Yuan Liu. Effects of alloying element and pore structure on mechanical property and corrosion properties of Gasar Mg Alloy[J]. Rare Metal Materials and Engineering,2022,51(2):637~644.]
DOI：10.12442/j. issn.1002-185X.20210133

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  • 收稿日期:2021-02-18
  • 最后修改日期:2021-04-23
  • 錄用日期:2021-05-12
  • 在線發(fā)布日期: 2022-03-09
  • 出版日期: 2022-02-28