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Effect of Rare Earth Er on Microstructure and Creep Behavior of Al–7Si–0.3Mg Alloy
S. Rashno,M. Reihanian,Khalil Ranjbar 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
The effect of 0.25 wt% and 0.5 wt% rare earth Er addition on the microstructure and creep behavior of the cast A356 alloywas investigated. The microstructure of the alloys before and after the creep was evaluated by optical and scanning electronmicroscopy equipped with energy dispersive spectrometry. The creep behavior was examined by the impression creep testat the temperature range of 493 to 553 K under the stresses between 480 and 680 MPa. Results showed that the additionof Er addition caused the α-Al dendrites to refine and the morphology of the eutectic silicon to modify significantly. Themicrostructure of the A356 alloy with Er addition was characterized by Er-rich intermetallics. The lattice self-diffusionclimb-controlled creep was found to be the dominant creep mechanism in all alloys. The addition of Er improved the creepresistance of the A356 alloy and the alloy modified with 0.5 wt% Er exhibited the highest creep resistance.
Microstructure and Impression Creep Behavior of Al–7Si–0.3Mg Alloy with Zr Addition
M. Reihanian,Khalil Ranjbar,S. Rashno 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
The effect of 0.25 wt% and 0.5 wt% Zr addition on the impression creep behavior of the cast A356 alloy was investigated. Optical and scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS) were used forexamination of the microstructure. The impression creep test was conducted at the temperature range of 493–553 K underthe stress range of 480–680 MPa (corresponding to the normalized stresses between 0.022 and 0.03). Microstructuralinvestigations showed that the Zr addition refined the α-Al grains and modified the eutectic structure. The Zr-containingalloys were characterized by Zr-rich intermetallics, suggesting the creep resistance of the A356 alloy was improved by Zraddition. The creep resistance of the A356–0.25Zr alloy was higher than that of the A356–0.5Zr alloy that was attributed tothe morphology and the distribution of intermetallics that are rich in Zr. Results showed that the lattice self-diffusion climbcontrolledcreep was the dominant creep mechanism in all alloys.
Rezai, Omran,Khodadadi, Ali,Heike, Yuji,Mostafai, Ali,Gerdabi, Nader Dashti,Rashno, Mohammad,Abdoli, Zahra Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16
Background: Leukemia is a common cancer among children and adolescents. Wilms' tumor gene (WT1) is highly expressed in patients with acute leukemia. It is found as a tumor associated antigen (TAA) in various types of hematopoietic malignancies and can be employed as a useful marker for targeted immunotherapy and monitoring of minimal residual disease (MRD). In this regard, WT1 is a transcription factor that promotes gene activation or repression depending on cellular and promoter context. The purpose of this study was assessment of WT1 gene expression in patients with acute leukemia, measurement of IL-12 and C3 levels in serum and evaluation of the relationship between them. Materials and Methods: We evaluated the expression of WT1 mRNA using real-time quantitative RT-PCR and serum levels of IL-12 and C3 using ELISA and nephelometry in peripheral blood of 12 newly diagnosed patients with acute leukemia and 12 controls. Results: The results of our study showed that the average wT1 gene expression in patients was 7.7 times higher than in healthy controls (P <0.05). In addition, IL-12 (P = 0.003) and C3 (P <0.0001) were significantly decreased in the test group compared to controls. Conclusions: WT1 expression levels are significantly higher in patients compared with control subjects whereas serum levels of interleukin-12 and C3 are significantly lower in patients. Wt1 expression levels in patients are inversely related with serum levels of IL-12 and C3.