(1) given hardness, one is aluminum and the other is titanium alloy, as long as the two materials are pulled each other. The incision is made of aluminum. Because titanium is harder than aluminum.
(2) Compared with acid resistance, aluminum reacts immediately when it meets acid, and titanium has good acid resistance.
(3) Compared with alkali resistance, aluminum reacts with alkali, and titanium has good alkali resistance.
(3) Compared with strength, it is very hard to destroy aluminum with pliers and scissors, and titanium is very laborious.
(4) Compared with the color, aluminum draws a few strokes on a piece of white paper, leaving black scratches immediately, while titanium can't see the scratches.