@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    dct:description "<p style=\"margin-left:0px; margin-right:0px\">This SBIR Phase I effort will develop and demonstrate a novel manufacturing process based on severe plastic deformation (SPD) to refine and enhance the microstructure-properties of bulk tungsten. Tungsten, with its many unique characteristics, plays an important role in nuclear reactors including for the nuclear thermal propulsion engine. The refractory metal, however, still has a number of shortcomings which still need to be addressed. These include a high ductile-to-brittle transition temperature, low ductility and poor fracture toughness, low machinability and fabricability, low-temperature brittleness, radiation-induced brittleness, and a relatively low recrystallization (RX) temperature compared to its operation temperature. The use of W above its RX temperature interminably can be unsafe because its mechanical properties decrease in such an environment. Low-temperature brittleness also imposes restrictions on the application of W as a structural material. And, given its high hardness, high brittleness, and poor machinability, W parts can be very costly and time-consuming to manufacture. Past efforts to increase the ductility of W were primarily directed on alloying, grain refinement, extreme working, area reductions, impurity reductions, and heat treatments. While ductile W currently exists in wire form (e.g., filaments) through extensive working and area reduction, this approach is clearly not practical for applications where bulk size parts are needed.</p>" ;
    dct:identifier "TECHPORT_94678" ;
    dct:issued "2019-01-01"^^xsd:date ;
    dct:modified "2020-01-29"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "More Ductile Bulk Tungsten, Phase I" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "TECHPORT SUPPORT" ;
            vcard:hasEmail <mailto:hq-techport@mail.nasa.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/0e724553-1d58-47ef-b5fe-8ffdd5af0045/resource/9fde97da-8f72-4ae4-8e8f-17ae7e537370>,
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    dcat:keyword "active",
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        "amerigeoss",
        "ckan",
        "geo",
        "geoss",
        "marshall-space-flight-center",
        "national",
        "north-america",
        "united-states" .

<https://data.amerigeoss.org/dataset/0e724553-1d58-47ef-b5fe-8ffdd5af0045/resource/9fde97da-8f72-4ae4-8e8f-17ae7e537370> a dcat:Distribution ;
    dct:description "Techport Project XML Metadata" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:53:09.354081"^^xsd:dateTime ;
    dct:modified "2025-11-19T17:31:38.098147"^^xsd:dateTime ;
    dct:title "More Ductile Bulk Tungsten, Phase I" ;
    dcat:accessURL <https://techport.nasa.gov/api/projects/94678.xml> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/dataset/0e724553-1d58-47ef-b5fe-8ffdd5af0045/resource/da5a9a4a-4393-417c-b354-a0cc1675e288> a dcat:Distribution ;
    dct:description "Techport Project Page" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:53:09.354065"^^xsd:dateTime ;
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    dct:title "More Ductile Bulk Tungsten, Phase I" ;
    dcat:accessURL <https://techport.nasa.gov/view/94678> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/dataset/0e724553-1d58-47ef-b5fe-8ffdd5af0045/resource/e1e40958-d615-48d8-bf8c-5ec2a03c5c0b> a dcat:Distribution ;
    dct:description "Techport Project PDF Export" ;
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    dct:issued "2020-11-12T04:53:09.354086"^^xsd:dateTime ;
    dct:modified "2025-11-19T17:31:38.099171"^^xsd:dateTime ;
    dct:title "More Ductile Bulk Tungsten, Phase I" ;
    dcat:accessURL <https://techport.nasa.gov/datasheet/94678> ;
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<https://data.amerigeoss.org/dataset/0e724553-1d58-47ef-b5fe-8ffdd5af0045/resource/f24f7cfd-d0d2-4d78-95ea-f993ec7d004e> a dcat:Distribution ;
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    dct:title "More Ductile Bulk Tungsten, Phase I" ;
    dcat:accessURL <https://techport.nasa.gov/api/projects/94678> ;
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