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熱擠壓對不同攪拌時間制備的納米SiCp/Mg-9Al-1Zn復合材料組織和性能的影響
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山西省先進鎂基材料重點實驗室 太原理工大學 材料科學與工程學院,山西省先進鎂基材料重點實驗室 太原理工大學 材料科學與工程學院,山西省先進鎂基材料重點實驗室 太原理工大學 材料科學與工程學院,山西省先進鎂基材料重點實驗室 太原理工大學 材料科學與工程學院,山西省先進鎂基材料重點實驗室 太原理工大學 材料科學與工程學院

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國家自然科學基金項目；山西省國際合作項目；山西省高校科技創(chuàng)新項目


Effect of hot extrusion on the microstructure and mechanical properties of the SiCp/Mg-9Al-1Zn nanocomposite fabricated by different stir time
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Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Advanced Magnesium based Materials,School of Materials Science and Engineering,Taiyuan University of Technology

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National Natural Science Foundation of China; International Cooperation in Shanxi; Technological Innovation Programs of Higher Education Institutions in Shanxi

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    摘要:

    通過半固態(tài)攪拌鑄造和熱擠壓變形復合工藝制備出了質量分數為1%的納米SiCp/Mg-9Al-1Zn鎂基復合材料。研究了攪拌時間分別為10min和30min時對納米SiCp/Mg-9Al-1Zn鎂基復合材料的顯微組織和力學性能的影響。結果表明，對于鑄態(tài)的納米SiCp/Mg-9Al-1Zn鎂基復合材料來說，攪拌時間為30min時，基體的晶粒細化，但在晶界處析出的Mg17Al12相數量增多，網狀化嚴重且SiC團聚增加，使得復合材料的力學性能下降。而通過熱擠壓后，復合材料形成了粗晶與細晶交替的組織結構。特別是對于攪拌時間為30min的復合材料，細晶區(qū)增多且納米SiC顆粒分布更加均勻, 這就使得力學性能高于攪拌10min的擠壓態(tài)的SiCp/Mg-9Al-1Zn復合材料。

    Abstract:

    1wt% SiC nanoparticles reinforced Mg-9Al-1Zn magnesium matrix composite was fabricated by stir casting and hot extrusion. Effect of stirring for 10min and 30min respectively on microstructure and mechanical properties of SiCp/Mg-9Al-1Zn nanocomposite was researched. The results show that the grains of the matrix in the as-cast SiCp/Mg-9Al-1Zn nanocomposite stirring for 30min are mainly refined. But the mechanical properties of nanocomposite decline due to the increase of agglomerated SiC nanoparticles and Mg17Al12 phases with network morphology along the grain boundaries. After hot extrusion, a bimodal microstructure composed of alternate arrays of fine DRXed grains and relatively coarse DRXed grains is formed. Particularly, for as-extrusion nanocomposites stirring for 30min, the fine DRXed region can be increased and the distribution of SiC nanoparticles is more homogenous, which can exhibit superior mechanical properties compared with as-extruded SiCp/Mg-9Al-1Zn nanocomposite stirring for 10min.

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王萬華,王紅霞,任廣笑,程偉麗,張少雄.熱擠壓對不同攪拌時間制備的納米SiCp/Mg-9Al-1Zn復合材料組織和性能的影響[J].稀有金屬材料與工程,2017,46(10):2847~2851.[Wang Wanhua, Wang Hongxia, Ren Guangxiao, Cheng Weili, Zhang Shaoxiong. Effect of hot extrusion on the microstructure and mechanical properties of the SiCp/Mg-9Al-1Zn nanocomposite fabricated by different stir time[J]. Rare Metal Materials and Engineering,2017,46(10):2847~2851.]
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  • 收稿日期:2016-07-22
  • 最后修改日期:2017-01-08
  • 錄用日期:2017-02-21
  • 在線發(fā)布日期: 2017-12-01
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