Comparative study on high temperature deformation behavior and processing maps of Mg-4Zn-1RE-0.5Zr alloy with and without in-situ sub-micron sized TiB2 reinforcement  

作　　者：S.K.Sahoo S.K.Panigrahi 

机构地区：[1]Department of Mechanical Engineering, Indian Institute of Technology Madras,Chennai-600036,India [2]Applied Magnesium Research Group, Center of Excellence in Materials and Manufacturing for Futuristic Mobility, Indian Institute of Technology Madras,Chennai-600036,India

出　　处：《Journal of Magnesium and Alloys》2022年第12期3520-3541,共22页镁合金学报（英文）

基　　金：Department of Science and Technology, India [grant number of DST/TDT/AMT/ 2017/211(G)] (MEE/18–19/412/DSTX/SUSH) for the financial support and FIST grant, Department of Science and Technology, India [grant number SR/FST/ET11–059/2012 (G)] for funding electron microscope facility;a part of Center of Excellence (Co E) in Applied Magnesium Research (A Vertical of Center for Materials and Manufacturing for Futuristic Mobility), IIT Madras;the Ministry of Human Resource and Development for funding this CoE through grant number–SB20210992MEMHRD008517。

摘　　要：Mg-4Zn-1RE-0.5Zr (ZE41) Mg alloy is extensively used in the aerospace and automobile industries.In order to improve the applicability and performance,this alloy was engineered with in-situ Ti B2reinforcement to form Ti B2/ZE41 composite.The high temperature deformation behavior and manufacturability of the newly developed Ti B2/ZE41 composite and the parent ZE41 Mg alloy were studied via establishing constitutive modeling of flow stress,deformation activation energy and processing map over a temperature range of 250℃-450℃ and strain rate range of 0.001 s-1-10 s-1.The predicted flow stress behavior of both materials were found to be well consistent with the experimental values.A significant improvement in activation energy was found in Ti B2/ZE41 composite (171.54 k J/mol) as compared to the ZE41 alloy (148.15 k J/mol) due to the dispersed strengthening of in-situ Ti B2particles.The processing maps were developed via dynamic material modeling.A wider workability domain and higher peak efficiency (45%) were observed in Ti B2/ZE41 composite as compared to ZE41 alloy (41%).The Dynamic recrystallization is found to be the dominating deformation mechanism for both materials;however,particle stimulated nucleation was found to be an additional mode of deformation in Ti B2/ZE41 composite.The twinning and stress induced cracks were observed in both the materials at low temperature and high strain rate.A narrow range of instability zone is found in the present Ti B2/ZE41 composite among the existing published literature on Mg based composites.The detailed microstructural characterization was carried out in both workability and instability domains to establish the governing deformation mechanisms.

关 键 词：ZE41 Mg composite In-situ TiB2 particles ZE41 Mg alloy Constitutive equations Processing map Dynamic recrystallization 

分 类 号：TG146.22[一般工业技术—材料科学与工程]