退火温度对纤维复合Cu-12%Ag合金应力-应变行为的影响

Effect of annealing temperature on stress-strain behavior of Cu-12%Ag filamentary composite

采用大变形冷拉拔制备了双相纤维复合Cu-12%Ag合金,测定了不同温度退火的合金拉伸曲线,研究了退火温度对合金应力-应变行为的影响。在拉伸载荷作用下,400℃以下退火的合金主要发生弹性应变,500℃退火的合金主要发生塑性应变。退火温度达到300℃时,合金的抗拉强度和弹性模量均有一定程度的下降。退火温度高于300℃时,抗拉强度及弹性模量显著下降。当退火导致纤维界面密度及局部应变下降时,合金的塑性流变能力提高但强度下降。当退火导致界面分布不均匀时,则会同时损害双相组织的强化效应和塑性流变能力。

The Cu-12% Ag alloy with filamentary, structure of dual phases was prepared by heavy drawing deformation. The effect of annealing temperature on the stress-strain behavior was investigated by tensile test for the alloy annealed at different temperatures. Elastic strain is predominant for the alloy annealed at temperatures lower than 400℃ while plastic strain is predominant for the alloy annealed at 500℃ under the condition of tensile loading. The ultimate tensile strength and Young＇s modulus decrease to a certain degree with annealing temperature rising to 300℃. Significant reduction of ultimate tensile strength and Young＇s modulus occurs for the alloy annealed at temperatures higher than 300℃ . The capacity of plastic flow increases but the ultimate tensile strength decreases if annealing treatments result in reduction in interface density and local strain. The strengthening level and the capacity of plastic flow can be impaired if annealing treatments result in interface nonuniformity in the dual phase structure.