Sökning: "grain boundary migration"

Hittade 3 uppsatser innehållade orden grain boundary migration.

  1. 1. Influence of grain growth on the thermal structure of inner protoplanetary discs

    Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Sofia Savvidou; [2018]
    Nyckelord :protoplanetary disc; thermal structure; hydrodynamical simulations; grain size distribution; grain growth; opacity; iceline; Physics and Astronomy;

    Sammanfattning : Protoplanetary discs surround young stars for the first few million years after their formation and they are the birthplaces of planetary systems. The thermal structure of the discs is regulated by their dust content and the opacity that it provides. LÄS MER

  3. 2. Structural Reconnaissance Mapping of the Nasa Basement Window, Southern Norrbotten Caledonides

    Master-uppsats, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Hugo Hedin Baastrup; [2018]
    Nyckelord :Caledonides; Belt; Window; Thrust; Shear; Basement; Nappe; Tectonic; Arjeplog; Nasa; Saltfjellet; Overprint;

    Sammanfattning : Too few documentative descriptions exist from the reactivated Proterozoic Nasa Basement window in Sweden. This re-exposed crustal piece predominantly consisting of 1.8 Ga granite and volcanic basement rock lack structural evidences on maps. LÄS MER

  4. 3. Investigation of Ductility Dip at 1000˚C in Alloy 617

    Kandidat-uppsats, KTH/Materialvetenskap

    Författare :Julia Sjöström; Helena Åkesson; [2017]
    Nyckelord :Ductility dip cracking; Ni-based alloy; tortuous grain boundaries; intergranular precipitates; grain boundary migration; superalloy; M23C6; Ti N; C ; solid state cracking; dynamic recrystallization;

    Sammanfattning : Alloy 617 displays a ductility dip during straining at exactly 1000˚C, leading to brittle fracture. A sudden decrease in ductility appearing during Gleeble hot ductility tests of Ni-based superalloys is a well-known phenomenon, while its cause is unknown. LÄS MER