Assertion: tungsten | /r/HasProperty | alloyed with iron
Facets:
value: to form heavy alloys
type: PURPOSE
value: usually
type: TEMPORAL
Source sentences:
text: Tungsten, usually alloyed with nickel and iron or cobalt to form heavy alloys, is used in kinetic energy penetrators as an alternative to depleted uranium, in applications where uranium's radioactivity is problematic even in depleted form, or where uranium's additional pyrophoric properties are not desired (for example, in ordinary small arms bullets designed to penetrate body armor).