Aging Behavior of Nano-SiC/2014Al Composite Fabricated by Powder Metallurgy and Hot Extrusion Techniques  

作　　者：Zhiguo Wang Chuanpeng Li Huiyuan Wang Xian Zhu Min Wu Jiehua Li Qichuan Jiang 

机构地区：[1]Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering,Nanling Campus,Jilin University,Changchun 130025,China [2]Center of Analytical and Testing,Beihua University,Jilin 132013,China [3]Chair of Casting Research,Montanuniversitaet Leoben,Leoben 8700,Austria

出　　处：《Journal of Materials Science & Technology》2016年第10期1008-1012,共5页材料科学技术（英文版）

基　　金：Financial support by the National Basic Research Program of China(“973”Program,No.2012CB619600);the National Natural Science Foundation of China(No.51474111);the Science and Technology Development Project of Jilin Province(No.20160519002JH);support came from the Fundamental Research Funds for the Central Universities(JCKY-QKJC02);the Chang Bai Mountain Scholars Program(2013014)

摘　　要：The aging-hardening kinetics of powder metallurgy processed 2014Al alloy and its composite have been studied. The existence of n-SiC particulates leads to the increase of peak hardness. Interestingly, the aginghardening peak of the composite takes place at earlier time than that of the unreinforced alloy. Transmission electron microscopy（TEM） studies indicated that the major precipitation phases are Al_5Cu_2Mn_3 and θ′（Al_2Cu）. Besides, Ω phase appeared in both specimens at peak hardening condition, which has been rarely observed previously in aluminum metal matrix composites without Ag. Accelerated aging kinetics and increased peak hardness may be attributed to the higher dislocation density resulted from the mismatch of coefficients of thermal expansion between n-SiC and 2014Al matrix. The results are beneficial to fabricating high performance composites for the application in automobile field such as pistons, driveshaft tubes, brake rotors, bicycle frames, railroad brakes.The aging-hardening kinetics of powder metallurgy processed 2014Al alloy and its composite have been studied. The existence of n-SiC particulates leads to the increase of peak hardness. Interestingly, the aginghardening peak of the composite takes place at earlier time than that of the unreinforced alloy. Transmission electron microscopy（TEM） studies indicated that the major precipitation phases are Al_5Cu_2Mn_3 and θ′（Al_2Cu）. Besides, Ω phase appeared in both specimens at peak hardening condition, which has been rarely observed previously in aluminum metal matrix composites without Ag. Accelerated aging kinetics and increased peak hardness may be attributed to the higher dislocation density resulted from the mismatch of coefficients of thermal expansion between n-SiC and 2014Al matrix. The results are beneficial to fabricating high performance composites for the application in automobile field such as pistons, driveshaft tubes, brake rotors, bicycle frames, railroad brakes.

关 键 词：Metal matrix composites Nano-SiC Powder metallurgy Hot extrusion Aging hardening 

分 类 号：TB333[一般工业技术—材料科学与工程] TF124.34[冶金工程—粉末冶金]