Comprehensive study on quasi-static and dynamic mechanical properties and wear behavior of Mg–B4C composite compacted at several loading rates through powder metallurgy  

粉末冶金Mg−B4C复合材料的准静态、动态力学性能及磨损行为

作　　者：K.RAHMANI G.H.MAJZOOBI G.EBRAHIM-ZADEH M.KASHFI 

机构地区：[1]Mechanical Engineering Department,Bu-Ali Sina University,Hamedan 65174,Iran [2]Department of Soil Science,Faculty of Agriculture,Guilan University,Rasht 4199613776,Iran [3]Mechanical Engineering Department,Ayatollah Boroujerdi University,Boroujerd 6919969737,Iran

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第2期371-381,共11页中国有色金属学报（英文版）

摘　　要：The present study aims to fabricate and evaluate the mechanical properties and wear behavior of Mg metal matrix composite,reinforced by 0,1.5,3,5 and 10 vol.%B4C microparticles.Mg−B4C samples were fabricated at 450℃ and under different loading rates by using split Hopkinson bar(SHB),drop hammer(DH)and Instron(QS)at strain rates of 1600,800 and 0.008 s–1,respectively.The mechanical properties including microhardness,quasi-static and dynamic compressive strengths and wear behavior of samples were experimentally investigated.The results show that,the hardness of SHB and DH samples is obtained to be 20.2%and 5.7%higher than that of the QS sample,respectively.The wear rate and wear mass loss of Mg–10.0%B4C samples fabricated by SHB were determined lower than those of the QS sample by nearly 33%and 39%,respectively.The quasi-static compressive strengths of Mg−5.0%B4C are improved by 39%,30%and 29%for the SHB,DH and QS samples,respectively,in comparison with the case of pure Mg.Furthermore,it is discovered that the dynamic compressive strength of samples is 51%−110%higher than their quasi-static value with respect to the B4C content.制备体积分数分别为0、1.5%、3%、5%和10%B4C颗粒增强Mg金属基复合材料,研究其力学性能和磨损行为。在450℃和不同加载速率下,分别采用分离式霍普金森棒(SHB)、锻锤(DH)和Instron(QS)制备Mg−B4C样品,其应变速率分别为1600、800和0.008 s−1。研究Mg−B4C复合材料的显微硬度、准静态及动态抗压强度等力学性能和磨损性能。结果显示,SHB和DH样品的硬度分别比QS样品高20.2%和5.7%。SHB法制备的Mg−10.0%B4C样品的磨损率和磨损质量损失分别比QS样品的低33%和39%。与纯Mg相比,SHB、DH和QS制备的Mg−5.0%B4C样品的准静态抗压强度分别提高39%、30%和29%。此外,含B4C样品的动态抗压强度比准静态抗压强度提高51%~110%。

关 键 词：powder compaction high strain rate Mg−B4C composite hardness mechanical properties wear behavior 

分 类 号：TB333[一般工业技术—材料科学与工程]