Program to Develop High Strength Aluminum Powder Metallurgy Products. Phase IV. Scale up to 3200lb. Billets.

摘要

Preheating with Ar or no gas flow followed by evacuation and vacuum hot pressing gave P/M wrought products with high fracture toughness only when the vacuum can temperature was maintained above 800F. Vacuum preheating and vacuum hot pressing imparted high toughness in P/M wrought products for can temperatures from 600F to 820F. MA87extrusions from compacts preheated below the alloy solidus gave higher transverse fracture toughness than earlier extrusions preheated above the solidus temperature.