High-strength and high-RRR Al-Ni alloy for aluminum-stabilized superconductor
High-strength and high-RRR Al-Ni alloy for aluminum-stabilized superconductor
复制标题
铝稳定超导体用高强度高RRR铝镍合金
DOI：
10.1109/77.828403
复制
发表时间：
2000
影响因子：
1.8
通讯作者：
Y. Makida
中科院分区：
文献类型：
--
作者：
K. Wada;S. Meguro;H. Sakamoto;A. Yamamoto;Y. Makida
沉淀型铝合金具有优异的性能，因为与具有固溶体状态的添加剂的铝合金相比，具有沉淀状态的添加剂的铝合金的电阻率的增加速率相当低。通过增加所选添加元素的含量，可以在不显著降低残余电阻率比（RRR）的情况下提高机械强度。镍是合适的添加元素，因为它在铝中的溶解度很低，电阻率的增加率低，而且镍和铝形成金属间化合物，有效地阻止位错的运动。首先，研制了用于ATLAS超导薄螺线管的Al-0.1wt%Ni合金。该合金实现了79 MPa（R.T.）的高屈服强度。经21%的断面收缩率冷加工后，可获得117 MPa（4.2K）的高抗拉强度，达到490。这些高度平衡的性能是以前开发的固溶体铝合金无法实现的。为了实现比上述更高的强度，研究了Ni含量高达2.0重量%的Al-Ni合金。Al-2.0wt%Ni合金的屈服强度达到120 MPa（R.T.）断面收缩率为20%的冷加工后，其抗拉强度为167 MPa（4.2K），抗拉强度为170。
The precipitation type aluminum alloys have excellent performance as the increasing rate in electric resistivity with additives in the precipitation state is considerably low, compared to that of the aluminum alloy with additives in the solid-solution state. It is possible to enhance the mechanical strength without remarkable degradation in residual resistivity ratio (RRR) by increasing content of selected additive elements. Nickel is the suitable additive element because it has very low solubility in aluminum and low increasing rate in electric resistivity, and furthermore, nickel and aluminum form intermetallic compounds which effectively resist the motion of dislocations. First, Al-0.1wt%Ni alloy was developed for the ATLAS thin superconducting solenoid. This alloy achieved high yield strength of 79 MPa (R.T.) and 117 MPa (4.2 K) with high RRR of 490 after cold working of 21% in area reduction. These highly balanced properties could not be achieved with previously developed solid-solution aluminum alloys. In order to achieve higher strength than the above, Al-Ni alloys of up to 2.0 wt% Ni content were investigated. Al-2.0wt%Ni alloy achieved yield strength of 120 MPa (R.T.) and 167 MPa (4.2 K) with RRR of 170 after cold working of 20% in area reduction.