noun
light alloy
Technical term for a metal alloy with low density, such as aluminum or magnesium alloys.
航空機の部品には軽合金がよく使われる。
Light alloys are often used for aircraft parts.
合金 is a general term for any alloy, while 軽合金 specifically refers to low-density alloys.
Compound of 軽 (light) and 合金 (alloy).