论文部分内容阅读
探讨了Ag,Sn,Mg,S i,RE几种合金化元素对Cu-0.3%C r-0.1%Zr合金力学性能和导电性能的影响。所有合金试样经940℃固溶处理1 h后淬火,冷拉拔至加工变形量为20%,分别在350,400,450,500和550℃时效处理3.5 h。测试结果表明,在400℃时效3.5 h时,含Ag合金的抗拉强度和电导率最高,分别高于其他合金10~70 MPa和1.5%~5.0%IACS。合金化元素提高合金强度的能力由大到小依次为Ag,Sn,Mg,RE,S i;而在提高电导率方面由强到弱则依次为Ag,RE,Mg,Sn,S。i含S i合金具有较低的伸长率,约为6.6%,而其他几种合金的伸长率相差不大,均在12%左右。采用TEM观察了Cu-0.3%C r-0.1%Zr-0.1%Ag合金在400℃时效3.5 h的组织,发现两种析出相,选区电子衍射标定结果表明它们分别是C r和Cu4Zr。合金性能主要由析出相的尺寸、分布和数量决定,而不同合金化元素对Cu-C r-Zr合金的强化机制以及时效后在基体中的存在状态是造成性能差异的主要原因。
The effects of several alloying elements such as Ag, Sn, Mg, Si and RE on the mechanical properties and electrical conductivity of Cu-0.3% C r-0.1% Zr alloy were discussed. All the alloys were quenched by solution heat treatment at 940 ℃ for 1 h and then cold-drawn to a deformation of 20%. The specimens were aged at 350, 400, 450, 500 and 550 ℃ for 3.5 h. The results show that the tensile strength and electrical conductivity of Ag-containing alloys are the highest at 3.5 h aging at 400 ℃, which are 10 ~ 70 MPa and 1.5% ~ 5.0% IACS, respectively. The ability of alloying elements to improve the strength of the alloy from large to small in order of Ag, Sn, Mg, RE, Si; and to improve the conductivity from strong to weak, followed by Ag, RE, Mg, Sn, i with S i alloy has a lower elongation, about 6.6%, while the other several types of alloy elongation difference, are about 12%. The microstructure of Cu-0.3% C r-0.1% Zr-0.1% Ag alloy aged at 400 ℃ for 3.5 h was observed by TEM. The results of the electron diffraction of the two precipitates and the selected areas show that they are C r and Cu 4 Zr, respectively. The properties of the alloy are mainly determined by the size, distribution and quantity of the precipitated phase. The strengthening mechanism of the Cu-Cr-Zr alloy by different alloying elements and the existence state in the matrix after aging are the main causes of the performance difference.