@themanj the other issue is tungsten by itself is too brittle for a shield.
Tungsten and many tungsten alloys aren't that great compared to maraging steel:
https://www.tungsten.com/products/tungsten-alloy/
https://www-plansee-com.azureedge.net/fileadmin/user_upload/Fracture_Toughness_of_Polycrystalline_Tungsten_Alloys_2009.pdf
https://en.wikipedia.org/wiki/Maraging_steel#Physical_properties
By the way some jet engine blades are a single crystal: https://www.theengineer.co.uk/rolls-royce-single-crystal-turbine-blade/
https://www.americanscientist.org/article/each-blade-a-single-crystal