Age hardening in beryllium-aluminum-silver alloys

✍ Scribed by D.H. Carter; A.C. McGeorge; L.A. Jacobson; P.W. Stanek

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 480 KB
• Volume: 44
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/1359-6454(96)00113-9

✦ Synopsis

Three different alloys of beryllium-aluminum-silver were processed to powder by centrifugal atomization in a helium atmosphere. Alloy compositions were, by weight percent, Bee47.5AlL2.5Ag. Be-47AlP3Ag, and Be-46A1-1Ag. Due to the low solubility of both aluminum and silver in beryllium, the silver was concentrated in the aluminum phase, which separates from the beryllium in the liquid phase. A fine, continuous composite beryllium-aluminum microstructure was formed, which did not significantly change after hot isostatic pressing. Samples of hot isostatically pressed material were solution treated at 550°C for 1 h, followed by a water quench. Aging temperatures were 150, 175, 200, and 22YC for times ranging from half an hour to 65 h. Results indicate that peak hardness was reached in 3&40 h at 175'C and 12-16 h at 200°C aging temperature, relatively independent of alloy composition. Coplwght c 1996 --.