论文部分内容阅读
研究了Co元素对Cu-3.0Ni-0.75Si合金电导率、硬度和软化温度演变规律的影响,并探讨了高温条件下Cu-3.0Ni-0.75Si-x Co合金电导率、硬度和抗拉强度随温度的变化规律,使用扫描电镜(SEM)对合金的拉伸断口形貌进行了分析。结果表明:经热轧,950℃×1 h固溶处理,一次冷轧,450℃×2 h时效处理和二次冷轧后,随着Cu-3.0Ni-0.75Si-x Co合金中Co含量的增加,合金的电导率先升后降,硬度和软化温度则不断升高,在二次冷轧后Cu-3.0Ni-0.75Si-0.5Co合金的软化温度能达到430℃,与未添加Co元素的Cu-3.0Ni-0.75Si合金相比,提高了约30℃。二次冷轧后的4种合金试样分别在350~550℃之间五个温度保温2 h,随着保温温度的升高,合金的电导率先升高后降低,抗拉强度和硬度则不断下降,延伸率不断上升,观察二次冷轧后分别在450和550℃保温2 h的试样拉伸断口形貌,进一步说明加热温度越高合金的塑性越好。在相同处理条件下,Co含量越高的Cu-3.0Ni-0.75Si-x Co合金,其抗拉强度也越高。
The effect of Co element on the evolution of electrical conductivity, hardness and softening temperature of Cu-3.0Ni-0.75Si alloy was studied. The conductivity, hardness and tensile strength of Cu-3.0Ni-0.75Si-xCo alloy under high temperature With the change of temperature, the tensile fracture morphology of the alloy was analyzed by scanning electron microscopy (SEM). The results show that with the increase of Co content in Cu-3.0Ni-0.75Si-xCo alloy after hot rolling, solution treatment at 950 ℃ for 1 h, primary cold rolling, aging treatment at 450 ℃ for 2 h and secondary cold rolling, , The electrical conductivity of the alloy increases first and then decreases, while the hardness and softening temperature increase continuously. The softening temperature of Cu-3.0Ni-0.75Si-0.5Co alloy reaches 430 ℃ after secondary cold-rolling, Cu-3.0Ni-0.75Si alloy compared to about 30 ℃. Four kinds of alloy samples after secondary cold rolling were respectively kept at five temperatures between 350 and 550 ℃ for 2 h. With the increase of holding temperature, the electrical conductivity of the alloy first increased and then decreased, and the tensile strength and hardness kept constant The elongation and elongation of the specimens were observed. The tensile fracture appearances of the specimens which were incubated at 450 and 550 ℃ for 2 h after secondary cold rolling were observed. The results showed that the higher the heating temperature, the better the plasticity of the alloy. Under the same treatment conditions, the higher the content of Co-Cu-3.0Ni-0.75Si-xC alloy, the higher the tensile strength.