Abstract
A novel compact preparation process has been developed to produce a Cu-20Ni-20Mn alloy. This process involves heating-cooling combined mould (HCCM) continuous casting, a solution treatment at 800 °C, rolling at room temperature and a final ageing step at 450 °C. This process eliminates two hot deformation processes, namely, hot forging and hot rolling, greatly improving production efficiency and reducing production costs compared with the traditional preparation process. The alloy fabricated by this process was found to have excellent mechanical properties. Additionally, the formation of precipitated phases during the ageing step is accelerated by this new process. The hardness of the samples reaches 476 HV after ageing for 10 h. Stable, ordered precipitates of Ni3Mn(L12 phase) are observed in the rolled specimen, and the orientation relationship between the copper matrix and ordered Ni3Mn phase (L12 phase) is [200]Cu//[010]Ni3Mn and [011]Cu//[011]Ni3Mn. Precipitation strengthening is the main reason for the increase of strength of the sample during the ageing process. The mechanical properties and ageing precipitation process of the alloy are affected by the rolling process. The precipitation rate of the rolled sample is greatly increased during the ageing process, leading to a larger amount of precipitates.
Highlights
High-strength elastic copper alloys have been widely used in many fields and applications, such as the aerospace field and in petrochemical electronic equipment, due to their excellent properties, namely, their high strength, elasticity, good thermal conductivity, stress relaxation resistance, excellent corrosion resistance and wear resistance [1,2,3,4]
Thedifficulty difficulty alloy preparation production process, of of alloy preparation andand thethe production costcost are are greatly reduced by using process, which is conducive to the production application greatly reduced by using thisthis newnew process, which is conducive to the production andand application of of
Cu-20Ni-20Mn alloy alloy producedbybythis this compact preparation were investigated, andonresearch on the produced newnew compact preparation processprocess were investigated, and research the precipitation precipitation of the Cu-20Ni-20Mn alloyout wasbycarried out bya conducting a series of ageing process of theprocess
Summary
High-strength elastic copper alloys have been widely used in many fields and applications, such as the aerospace field and in petrochemical electronic equipment, due to their excellent properties, namely, their high strength, elasticity, good thermal conductivity, stress relaxation resistance, excellent corrosion resistance and wear resistance [1,2,3,4]. Thedifficulty difficulty alloy preparation production process, of of alloy preparation andand thethe production costcost are are greatly reduced by using process, which is conducive to the production application greatly reduced by using thisthis newnew process, which is conducive to the production andand application of of In this this paper, the microstructure microstructure and and mechanical mechanical property property evolutions evolutions of of the the Cu-20Ni-20Mn. Cu-20Ni-20Mn alloy alloy producedbybythis this compact preparation were investigated, andonresearch on the produced newnew compact preparation processprocess were investigated, and research the precipitation precipitation of the Cu-20Ni-20Mn alloyout wasbycarried out bya conducting a series of ageing process of theprocess.
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