文献类型：期刊文献

英文题名：The effect of T4 and T6 heat treatments for dynamic impact behavior of casting Mg-Gd-based alloys

作者：Wang, Xue-zhao[1];Wang, You-qiang[1,2];Ni, Chen-bing[1];Fang, Yu-xin[1];Yu, Xiao[1];Zhang, Ping[3,4]

机构：[1]Qingdao Univ Technol, Sch Mech & Automot Engn, Qingdao 266520, Peoples R China;[2]Minist Educ, Key Lab Ind Fluid Energy Conservat & Pollut Contro, Qingdao 266520, Peoples R China;[3]Qingdao Huanghai Univ, Coll Intelligent Mfg, Qingdao 266520, Peoples R China;[4]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, Peoples R China

年份：2022

卷号：205

外文期刊名：VACUUM

收录：SCI-EXPANDED(收录号：WOS:000863091400001)、、EI(收录号：20223612684688)、Scopus(收录号：2-s2.0-85137025165)、WOS

基金：This research was supported by the National Natural Science Foundation of China (Grant No. 51575289 and Grant No. 51705270) , the Key Research and Development Project of Shandong Province (Grant No. 2019GHY112068) , and the Natural Science Foundation of Shandong Province (Grant No. ZR2019PEE028) .

语种：英文

外文关键词：Mg-6.5Gd-3Y-0.5Zr alloy; Dynamic mechanical properties; Strain rates; Dynamic precipitated particles; Ageing precipitation phase

外文摘要：The study of dynamic impact properties of Mg-Gd alloy is important for its application in aerospace, automotive manufacturing and weaponry fields. In this work, the dynamic behaviors of the casting solid-solution (T4) and peak-aged (T6) Mg-6.5Gd-3Y-0.5Zr alloys were investigated at different strain rates by using optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), differential scanning calorimetry(DSC), X-ray diffraction(XRD), transmission electron microscopy(TEM), Vickers hardness testing, and split Hopkinson press bar(SHPB). Due to the dynamic precipitation phase during the SHPB and the residual rare earth hydride(REH) particles produce in the T4 treatment, the compressive strength of the casting T4-sample can reach 485 MPa at a strain rate of 3500 s(-1). The casting T6-alloy precipitated a reinforced phase beta ' and therefore exhibited an ultra-high compressive strength of 519 MPa at a high strain rate of 4500 s(-1). The dynamic compressive strength of a T4 sample is unaffected by strain rates, whereas the dynamic compressive strength of a T6-sample is sensitive. Based on fracture morphology, the cracks are made up of a 45 degrees loading direction crack on the cylindrical surface and a compressed surface crack. The fracture surface is characterized by cleavage planes and dimples. As the deformation strain-rate increases, the number of cleavage planes increases, while the proportion of dimples decreases. Under varied strain rates, it can likewise be deduced that cleavage fracture is the main fracture mechanism of the T6-alloy.