2Ca相沿基體合金晶界分布并有效細化Al2Ca相析出尺寸。隨著SiCp體積分數(shù)的增高,Al2Ca相尺寸有所降低,但不明顯。經過熱擠壓后,Al2Ca相破碎并沿擠壓方向排布,基體合金晶粒得到細化。晶粒尺寸以及Al2Ca相尺寸隨著SiCp體積分數(shù)的增高呈微小降低。與單組元基體合金相比較,擠壓態(tài)SiCp/Mg–5Al–2Ca復合材料的屈服強度和加工硬化率隨著SiCp體積分數(shù)的增高而逐漸增高,而延伸率則逐漸下降；抗拉強度最大值則出現(xiàn)在SiCp體積分數(shù)為5%時。復合材料中SiCp顆粒以及Al2Ca相的脫粘以及開裂是導致復合材料斷裂的主要原因。"/>

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SiCp顆粒含量對SiCp/ Mg–5Al–2Ca復合材料組織與性能的影響
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北京科技大學國家材料服役安全科學中心,太原理工大學材料科學與工程學院，先進鎂基材料山西省重點實驗室,太原理工大學材料科學與工程學院，先進鎂基材料山西省重點實驗室,太原理工大學材料科學與工程學院，先進鎂基材料山西省重點實驗室,太原理工大學材料科學與工程學院，先進鎂基材料山西省重點實驗室,太原理工大學材料科學與工程學院，先進鎂基材料山西省重點實驗室,太原理工大學材料科學與工程學院，先進鎂基材料山西省重點實驗室

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Effects of SiCp content on the microstructure and mechanical properties of SiCp/Mg–5Al–2Ca composites
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National center for materials service safety,University of Science and Technology,Beijing,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials, College of Materials Science and Engineering, Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology

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    摘要:

    本研究通過攪拌鑄造法制備了三種不同體積分數(shù)(2%,5%, 10%)的SiCp/Mg–5Al–2Ca復合材料,并在673 K下進行了熱擠壓。鑄態(tài)復合材料中,少量SiCp顆粒的加入就能破壞了Al2Ca相沿基體合金晶界分布并有效細化Al2Ca相析出尺寸。隨著SiCp體積分數(shù)的增高,Al2Ca相尺寸有所降低,但不明顯。經過熱擠壓后,Al2Ca相破碎并沿擠壓方向排布,基體合金晶粒得到細化。晶粒尺寸以及Al2Ca相尺寸隨著SiCp體積分數(shù)的增高呈微小降低。與單組元基體合金相比較,擠壓態(tài)SiCp/Mg–5Al–2Ca復合材料的屈服強度和加工硬化率隨著SiCp體積分數(shù)的增高而逐漸增高,而延伸率則逐漸下降；抗拉強度最大值則出現(xiàn)在SiCp體積分數(shù)為5%時。復合材料中SiCp顆粒以及Al2Ca相的脫粘以及開裂是導致復合材料斷裂的主要原因。

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    The Mg–5Al–2Ca alloys reinforced by 2 vol.%, 5 vol.% and 10 vol.% 5μm SiCp were fabricated by stir casting. The cast composites were subject to hot extrusion. In the cast composites, addition of SiCp disturbs the network distribution of Al2Ca phase along grain boundaries. After extrusion, grains of the matrix are refined further and the Al2Ca phase broke into particulates. Moreover, the Al2Ca phase and grain size can be further refined by the addition of SiCp. As compared with monolithic Mg–5Al–2Ca alloy, the addition of SiCp conduces to obvious improvement of TYS and work hardening rate, however, at the expense of elongation. Unlike the TYS, the UTS of SiCp/Mg-5Al-2Ca composite does not change monotonously with increasing SiCp’s content, the highest UTS appears when the SiCp’s volume fraction is 5%. The interfacial debonding between SiCp and Al2Ca phase and cracked particles are considered as the main crack source for SiCp/Mg–5Al–2Ca composite.

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常海,王翠菊,鄧坤坤,聶凱波,蘇坤,廖玲,王紅霞. SiCp顆粒含量對SiCp/ Mg–5Al–2Ca復合材料組織與性能的影響[J].稀有金屬材料與工程,2018,47(5):1377~1384.[Hai Chang, Cui-ju Wang, Kun-kun Deng, Kai-bo Nie, Kun Su, Ling Liao, Hong-xia Wang. Effects of SiCp content on the microstructure and mechanical properties of SiCp/Mg–5Al–2Ca composites[J]. Rare Metal Materials and Engineering,2018,47(5):1377~1384.]
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  • 收稿日期:2017-04-10
  • 最后修改日期:2017-08-14
  • 錄用日期:2017-11-08
  • 在線發(fā)布日期: 2018-06-08
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