After a certain amount of hammering (cold-working), copper becomes brittle, a condition that can be removed as often as necessary by heating the material and plunging it into cold water (quenching).
It is malleable; that is, it can be shaped by hammering while cold.
IN nearly 15 years of writing this column every week, the cold hammer of oppression has come down on me from New York just once, more than 10 years ago.
Our plot looks a bit hammered by the cold – and what has survived has nbeen hammered by the pigeons.
The drab landscape is apparently hammered flat by cold rain.
The spouts of the ewers were cast in molds and attached to the bodies by means of copper rivets or were simply inserted in place and crimped to the bodies by cold hammering.
Gold can be agglomerated into larger pieces by cold hammering, but native copper cannot, and an essential step toward the Metal Age was the discovery that metals such as copper could be fashioned into shapes by melting and casting in molds; among the earliest known products of this type are copper axes cast in the Balkans in the 4th millennium bc.
The P90's barrel is cold hammer-forged and chrome-lined, with an overall length of 263 mm (10.4 in).
The Five-seven barrel is cold hammer-forged and chrome-lined, with a total length of 122 mm and a rifled length of 94 mm.
Briefly, frozen liver, kidney, lungs, brain, heart, mammary gland, and WAT samples were minced by hammering on a cold metal surface, and immediately transferred to 12-mL tubes together with lysis buffer [25 mM Tris-acetate (pH 7.8), 1.5 mM EDTA, 10% glycerol, 1% Triton-X, 2 mM dithiothreitol (Sigma) containing Complete Tablets Roche Diagnostics GmbHs (Roche Diagnostics GmbH, Penzberg, Germany)].
