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| 1 | Microstructure refinement,mechanical and biocorrosion properties of Mg–Zn–Ca–Mn alloy improved by a new severe plastic deformation process显示文摘In this study,the microstructural evolution,mechanical properties and biocorrosion performance of a Mg–Zn–Ca–Mn alloy were investigated under different conditions of heat treatment,extrusion,one pass and two passes of half equal channel angular pressing(HECAP)process.The results showed significant grain refinement of the homogenized alloy after two passes of HECAP process from 345μm to 2μm.Field emission scanning electron microscopy(FESEM)revealed the presence of finer Mg_(6)Zn_(3)Ca_(2)phase as well asα-Mn phase after HECAP process.The results also showed that mechanical characteristics such as yield strength,ultimate tensile strength and elongation of the HECAPed samples improved by~208%,~144%and~100%compared to the homogenized one,respectively.Crystallographic texture analysis indicated that most of the grains at the surface were reoriented parallel to the(0001)basal plane after HECAP process.Electrochemical corrosion tests and immersion results indicated that the sample with two passes of HEACP had the highest biocorrosion resistance confirming that the basal planes had the lowest corrosion rate compared to the non-basal ones.The mechanical behavior and bio-corrosion evaluation demonstrated that the HECAPed Mg–Zn–Ca–Mn alloy has great potential for biomedical applications and a mechanism was proposed to explain the interrelations between the thermomechanical processing and bio-corrosion behavior. | M.Kavyani G.R.Ebrahimi H.R.Ezatpour M.Jahazi | 2022 | Journal of Magnesium and Alloys2022，10，6： | 4 |
| 2 | 不同温度下AA6061/Al_2O_3纳米复合材料的加工图和组织评价(英文)显示文摘为确定热加工性能的最佳条件,在温度350~500°C、应变率0.0005~0.5 s^(-1)下研究Al6061/Al_2O_3纳米复合材料的热压缩行为。采用双曲正弦函数得到材料热压缩测试活化能为285 kJ/mol。用动态材料模型和相应的加工图,确定了温度450°C、应变速率0.0005 s^(-1)和温度500°C、应变速率0.0005~0.5 s^(-1)为Al6061/Al_2O_3材料的热加工性能安全区,最大功率损耗率为38%。由于材料大变形,在温度400°C和应变速率0.5 s^(-1)下得到了被伸长和扭结晶粒。 | H.R.EZATPOUR S.A.SAJJADI M.HADDAD SABZEVAR A.CHAICHI G.R.EBRAHIMI | 2017 | Transactions of Nonferrous Metals Society of China2017，27，6： | 2 |
| 3 | Microstructural evolution of a superaustenitic stainless steel during a two-step deformation process显示文摘Single-and two-step hot compression experiments were carried out on 16Cr25Ni6Mo superaustenitic stainless steel in the temperature range from 950 to 1150°C and at a strain rate of 0.1 s^(-1). In the two-step tests, the first pass was interrupted at a strain of 0.2; after an interpass time of 5, 20, 40, 60, or 80 s, the test was resumed. The progress of dynamic recrystallization at the interruption strain was less than 10%. The static softening in the interpass period increased with increasing deformation temperature and increasing interpass time. The static recrystallization was found to be responsible for fast static softening in the temperature range from 950 to 1050°C. However, the gentle static softening at 1100 and 1150°C was attributed to the combination of static and metadynamic recrystallizations. The correlation between calculated fractional softening and microstructural observations showed that approximately 30% of interpass softening could be attributed to the static recovery. The microstructural observations illustrated the formation of fine recrystallized grains at the grain boundaries at longer interpass time. The Avrami kinetics equation was used to establish a relationship between the fractional softening and the interpass period. The activation energy for static softening was determined as 276 kJ/mol. | N.Bayat G.R.Ebrahimi A.Momeni H.R.Ezatpour | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，2： | 2 |
| 4 | 含Ⅰ相Mg-Zn-Y合金的高温变形行为和加工图(英文)显示文摘通过热压缩试验(温度300~450℃,应变速率0.001~1 s^(-1))研究挤压态含Y元素的Mg-Zn合金的微观组织和力学性能。用热加工图反映合金热变形的最佳条件和非稳定区。Mg-Zn和Mg-Zn-Y合金的峰值应力、温度和应变速率的关系符合双曲正弦函数,激活能分别为177 k J/mol和236 k J/mol。流变应力曲线表明,Y的添加会增加峰值应力并减小峰值应变,且Mg-Zn-Y合金发生动态再结晶所需的应变比Mg-Zn合金的小。Mg-Zn-Y合金的稳定区发生在:1)300℃,0.001 s^(-1);350℃,0.01-0.1 s^(-1)和400℃,0.01 s^(-1);2)450℃,0.01-0.1 s^(-1)。显微组织的观察结果显示,合金中主要的恢复机制是动态再结晶,Mg-Zn-Y合金发生完全动态再结晶的温度为450℃。在高应变速率下,Mg-Zn-Y合金明显形成非稳定区。另外,Mg-Zn和Mg-Zn-Y合金的非稳定区域宽度随应变的增加而增加,这些区域还发生了孪生和严重变形。 | M.CHAMAN-ARA G.R.EBRAHIMI H.R.EZATPOUR | 2018 | Transactions of Nonferrous Metals Society of China2018，28，4： | 1 |
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