| Title |
Effects of Heat - Treatment on the Microstructure and Mechanical Properties of Cu - 1.9 % Be - O.2 % Co Alloy |
| Authors |
윤용구(Young K . Yoon); 유연철(Yeon C . Yoo); 최인훈(In H . Choi) |
| Abstract |
Cu-1.9% Be-0.2% Co alloy has excellent mechanical properties such as tensile strength, hardness and fatigue strength(spring characteristics), and is widely used for spring applications. In the present study, heat-treating conditions were investigated in relation to mechanical properties and the micro-structure of the aged alloy. Heat-treating conditions for specimens of 35% final cold-reduction, namely, aging for 2 hours at 330℃ after solution anneal of 0.8㎜ thick specimens for 15 minutes at 800℃ resulted in optimum mechanical properties of 136 ㎏/㎟ tensile strength, 440 micro-Vickers hardness, 2% elongation and 85 ㎏/㎟ fatigue strength. The aging sequence of the alloy established by thin-foil transmission electron microscopy is α→ G.P. zones→γ¹→γ in within grain and α→γ at grain boundaries. |