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Microstructure, mechanical properties and formability of friction stir welded dissimilar materials of IF-steel and 6061 Al alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 722-731页

作者： Semih Mahmut Aktarer dursun murat sekban Tevfik Kucukomeroglu Gencaga Purcek Department of Automotive Technology Recep Tayyip Erdogan UniversityRize 53020Turkey Department of Naval Architecture and Marine Engineering Karadeniz Technical UniversityTrabzon 61530Turkey Department of Mechanical Engineering Karadeniz Technical UniversityTrabzon 61080Turkey

AA 6061 alloy and interstitial-free(IF)steel plates were joined by the friction stir welding(FSW)method,and the microstructure,mechanical properties,and biaxial stretch formability of the friction stir welded(FSWed)parts were *** results indicate that the FSWed parts showed optimum tensile strength during FSW with the 0.4-mm offset position of the *** Fe4Al13 intermetallic compound formed in the defect-free intersection of AA 6061 and IF-steel plates during *** hardness of the IF-steel part of the FSWed region increased almost 90%relative to its initial hardness of HV0.2 *** tensile and yield strengths of FSWed regions were approximately 170 MPa and 145 MPa,*** to the formability tests,the Erichsen Index(EI)of the IF-steel,AA 6061,and the FSWed samples were determined to be 2.9 mm,1.9 mm,and 2.1 mm,*** EI of the FSWed sample was almost the same as that of the AA 6061 ***,it decreased compared with that of the *** force at EI(FEI)was approximately 1180 N for the FSWed *** value is approximately 70%higher than that of AA 6061 alloy.

关键词： friction stir welding IF-steel aluminum alloy microstructure mechanical properties formability

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Concise review of radiosurgery for contemporary management of pilocytic astrocytomas in children and adults

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World Journal of Experimental Medicine 2022年第3期12卷 36-43页

作者： Omer Sager Ferrat Dincoglan Selcuk Demiral Bora Uysal Hakan Gamsiz Esra Gumustepe Fatih Ozcan Onurhan Colak Ahmet Tarik Gursoy Cemal Ugur dursun Ahmet Oguz Tugcu Galip Dogukan Dogru Rukiyye Arslan Yelda Elcim Esin Gundem Bahar Dirican murat Beyzadeoglu Department of Radiation Oncology Gulhane Medical FacultyUniversity of Health SciencesAnkara 0090Turkey

Pilocytic astrocytoma(PA)may be seen in both adults and children as a distinct histologic and biologic subset of low-grade *** is the principal treatment for the management of PAs;however,selected patients may benefit from irradiation particularly in the setting of inoperability,incomplete resection,or recurrent *** conventionally fractionated radiation therapy has been traditionally utilized for radiotherapeutic management,stereotactic irradiation strategies have been introduced more recently to improve the toxicity profile of radiation delivery without compromising tumor *** may be suitable for radiosurgical management due to their typical appearance as well circumscribed *** and precise targeting of these well-defined lesions under stereotactic immobilization and image guidance may offer great potential for achieving an improved therapeutic ratio by virtue of radiosurgical *** the high conformality along with steep dose gradients around the target volume allowing for reduced normal tissue exposure,radiosurgery may be considered a viable modality of radiotherapeutic *** advantage of radiosurgery may be the completion of therapy in a usually shorter overall treatment time,which may be particularly well suited for children with requirement of anesthesia during *** studies have addressed the utility of radiosurgery particularly as an adjuvant or salvage treatment modality for ***,despite the growing body of evidence supporting the use of radiosurgery,there is need for a high level of evidence to dictate treatment decisions and establish its optimal role in the management of ***,we provide a concise review of radiosurgery for PA in light of the literature.

关键词： Pilocytic astrocytoma Radiosurgery Stereotactic irradiation Low-grade glioma Radiation oncology Children

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