常海,王翠菊,邓坤坤,聂凯波,苏坤,廖玲,王红霞.SiCp颗粒含量对SiCp/ Mg–5Al–2Ca复合材料组织与性能的影响[J].稀有金属材料与工程,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.]
SiCp颗粒含量对SiCp/ Mg–5Al–2Ca复合材料组织与性能的影响
投稿时间:2017-04-10  修订日期:2017-08-14
中文关键词:  镁基复合材料  挤压  增强相  SiCp  显微组织  机械性能
基金项目:
中文摘要:
      本研究通过搅拌铸造法制备了三种不同体积分数(2%,5%, 10%)的SiCp/Mg–5Al–2Ca复合材料,并在673 K下进行了热挤压。铸态复合材料中,少量SiCp颗粒的加入就能破坏了Al2Ca相沿基体合金晶界分布并有效细化Al2Ca相析出尺寸。随着SiCp体积分数的增高,Al2Ca相尺寸有所降低,但不明显。经过热挤压后,Al2Ca相破碎并沿挤压方向排布,基体合金晶粒得到细化。晶粒尺寸以及Al2Ca相尺寸随着SiCp体积分数的增高呈微小降低。与单组元基体合金相比较,挤压态SiCp/Mg–5Al–2Ca复合材料的屈服强度和加工硬化率随着SiCp体积分数的增高而逐渐增高,而延伸率则逐渐下降;抗拉强度最大值则出现在SiCp体积分数为5%时。复合材料中SiCp颗粒以及Al2Ca相的脱粘以及开裂是导致复合材料断裂的主要原因。
Effects of SiCp content on the microstructure and mechanical properties of SiCp/Mg–5Al–2Ca composites
英文关键词:Magnesium matrix composite  Extrusion  Al2Ca phase  Microstructure  Mechanical property.
英文摘要:
      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.
作者单位E-mail
常海 北京科技大学国家材料服役安全科学中心 hchang@ustb.edu.cn 
王翠菊 太原理工大学材料科学与工程学院先进镁基材料山西省重点实验室  
邓坤坤 太原理工大学材料科学与工程学院先进镁基材料山西省重点实验室  
聂凯波 太原理工大学材料科学与工程学院先进镁基材料山西省重点实验室  
苏坤 太原理工大学材料科学与工程学院先进镁基材料山西省重点实验室  
廖玲 太原理工大学材料科学与工程学院先进镁基材料山西省重点实验室  
王红霞 太原理工大学材料科学与工程学院先进镁基材料山西省重点实验室  
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