The scope of this work was to investigate microstructural, chemical and thermomechanical influences on the mechanical properties of single crystalline Co\u2013based superalloys. All investigations were carried out systematically by varying one feature gradually to characterize one specific influencing factor isolated from others.\nThe investigation of an alloy series with varying precipitate fraction but similar phase compositions revealed that the strengthening contribution of the \u03b3' phase increases with increasing volume fraction. The compressive and compressive creep strength is improved in a way that it is comparable to conventional Ni\u2013based superalloys, however, the stability of the two\u2013phase microstructure is diminished. Two multinary Co\u2013base superalloys showed that the initial \u03b3' size has a significant influence on the creep properties, whereas the shape and arrangement of the precipitates do not play a major role. It was confirmed that the directional coarsening of the \u03b3' phase significantly influences the double minimum creep behavior, however, also the importance of the deformation mechanisms and segregation to planar defects was shown. Therefore, the appearance of the minima could clearly be correlated to the formation of different planar defect configurations. Additionally, a preliminary study on the tension\u2013compression asymmetry during creep was conducted over a large temperature range. It was found that the asymmetry is pronounced differently at every temperature, however, differences between tensile and compressive creep appear at all conditions. Furthermore, the influence of the base elements Co and Ni on the deformation mechanisms was investigated. An alloy series with gradually varying base element content exhibited significantly better creep properties in the Ni\u2013rich alloys. After evaluating and discussing different strengthening contributions, the changing deformation mechanisms are mainly responsible for these observations. The characterization of deformed samples using a transmission electron microscope revealed a variety of occurring mechanisms according to the Co\/Ni content, ranging from superlattice stacking faults on the Ni\u2013rich side to extended antiphase boundaries in the Co\u2013rich alloys. These results helped to achieve a better understanding of the plastic deformation behavior of Co-base superalloys and to develop new design criteria for future alloy development.<\/p>","protected":false},"excerpt":{"rendered":"
Im Rahmen dieser Arbeit wurden mikrostrukturelle, chemische und thermo-mechanische Einflussfaktoren auf die mechanischen Eigenschaften von einkristallinen Co-Basis-Superlegierungen untersucht. Daf\u00fcr wurden systematische Untersuchungen durchgef\u00fchrt und die zu charakterisierenden Einflussfaktoren sukzessive variiert, sodass ein Einflussfaktor m\u00f6glichst isoliert von anderen betrachtet werden konnte. Bei der Untersuchung einer Legierungsserie, bei der nur der \u03b3\u2018 Ausscheidungsvolumenanteil, aber nicht die Phasenzusammensetzung […]<\/p>\n","protected":false},"featured_media":3437,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[58],"product_tag":[149,150,151,147,148],"class_list":{"0":"post-3435","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-fau-studien-materialwissenschaft-und-werkstofftechnik","7":"product_tag-mechanische-eigenschaft","8":"product_tag-werkstoffkunde","9":"product_tag-cobaltlegierung","10":"product_tag-elektronenmikroskopie","11":"product_tag-mikrostruktur","12":"has-post-title","13":"has-post-date","14":"has-post-category","15":"has-post-tag","16":"has-post-comment","17":"has-post-author","18":"","20":"first","21":"instock","22":"taxable","23":"shipping-taxable","24":"purchasable","25":"product-type-simple"},"acf":{"autor":"Volz, Nicklas","orcid":"0000-0003-0236-2649","ror":"","herausgeber":"","orcid_hrsg":"","rorhrsg":"","bearbeiter":"","sonstige_beteiligte_personen":"","untertitel":"","zusatz":"","jahr":"2023","zeitschrift":"","serie":"","serie_name":false,"serie_band":"","serie_jahr":"","serie_titel_band":"","vortrage":"","issn":"","isbn":"","isbn13":"978-3-96147-661-9","seiten":"xvi, 201","sonstiges":"","band":25,"auflage":"","opus":"","dspace":"23451","e-isbn_pdf":"978-3-96147-662-6","doi":"https:\/\/doi.org\/10.25593\/978-3-96147-662-6","epub":"","e-isbn_epub":"","doi_epub":"","html":"","e-isbn_html":"","doi_html":"","e-isbn_reader":"","doi_reader":"","digibib":"","urn":"urn:nbn:de:bvb:29-opus4-234512","supplementary_material":"","sprache":["Deutsch"],"ausgabe":"Softcover","suche":" 9783961476619 9783961476626 ","lizenz":"BY-4","bemerkung":""},"builder_content":"","_links":{"self":[{"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/product\/3435","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/comments?post=3435"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/media\/3437"}],"wp:attachment":[{"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/media?parent=3435"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/product_brand?post=3435"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/product_cat?post=3435"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.university-press.fau.de\/en\/wp-json\/wp\/v2\/product_tag?post=3435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}