冷变形和时效处理对含Y、Nd的Cu-Cr合金电导率及硬度的影响

为了达到提高铜基合金的强度而导电率无明显下降的目的, 通过添加稀土元素、形变强化和时效处理等手段制备了Cu-Cr-RE合金。研究表明, Cu-Cr-Nd/Y合金随变形量的增大, 导电率也增大。在480 ℃,时效初期0～6 min, 合金的电导率迅速上升, 之后随着时效时间的增加合金的电导率没有明显变化。Cu-Cr-Nd/Y合金的硬度随Nd/Y含量的增加而增加, 时效时间6 min左右能达到较大的硬度。稀土有净化合金的作用, 能有效提高合金的硬度, Nd比Y能更好地净化基体。

Effects of Cold Deformation and Aging Treatment on Conductivity and Hardness of Cu-Cr Alloy with Y and Nd

In order to improve the strength of copper-base alloys with no significant decline of the conductivity, Cu-Cr-RE alloys were prepared by adding rare earth elements, strain hardening and aging. Studies have shown that the conductivity of Cu-Cr-Nd/Y alloys increases with the increase of deformation. At 480 ℃, during the aging time of 0～6 min, there is a rapid increase in conductivity of the alloy. After that, with the increase of aging time, the conductivity of the alloy does not change significantly. The hardness of Cu-Cr-Nd/Y alloy increases with the increase of Nd/Y content and achieve a greater value at aging time of 6 min or so. Rare earth elements can purify the alloy and effectively improve the hardness of the alloy. Nd is better than Y in purifying the matrix.