Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (3): 375-384.DOI: 10.1007/s40195-019-00953-9
• Orginal Article • Previous Articles Next Articles
Tao Xiao1,2, Xiao-Fei Sheng3, Qian Lei1(), Jia-Lun Zhu2, Sheng-Yao Li2, Ze-Ru Liu2, Zhou Li2
Received:
2019-05-25
Revised:
2019-06-25
Online:
2020-03-10
Published:
2020-03-10
Contact:
Lei Qian
Tao Xiao, Xiao-Fei Sheng, Qian Lei, Jia-Lun Zhu, Sheng-Yao Li, Ze-Ru Liu, Zhou Li. Effect of Magnesium on Microstructure Refinements and Properties Enhancements in High-Strength CuNiSi Alloys[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(3): 375-384.
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Fig. 1 Optical micrographs of the dendritic microstructure in the as-cast studied alloys. a Cu-8.0Ni-1.8Si; b Cu-8.0Ni-1.8Si-0.15Mg; c Cu-6.0Ni-1.0Si-0.5Al; d Cu-6.0Ni-1.0Si-0.5Al-0.15Mg
Fig. 2 Optical micrographs of the solid solution-treated studied alloys. a Cu-8.0Ni-1.8Si; b Cu-8.0Ni-1.8Si-0.15Mg; c Cu-6.0Ni-1.0Si-0.5Al; d Cu-6.0Ni-1.0Si-0.5Al-0.15Mg
Fig. 4 Stress-strain curves and fractures of the studied alloys. a Stress-strain curves of Cu-8.0Ni-1.8Si and Cu-8.0Ni-1.8Si-0.15Mg alloys; b fracture of Cu-8.0Ni-1.8Si alloy tensile tested sample; c fracture of Cu-8.0Ni-1.8Si-0.15Mg alloy tensile tested sample; d stress-strain curves of Cu-6.0Ni-1.0Si-0.5Al and Cu-6.0Ni-1.0Si-0.5Al-0.15Mg alloys; e fracture of Cu-6.0Ni-1.0Si-0.5Al alloy tensile tested sample; f fracture of Cu-6.0Ni-1.0Si-0.5Al-0.15Mg alloy tensile tested sample
Fig. 5 Bright-field micrographs of microstructural evolutions in Cu-8.0Ni-1.8Si-(0.15Mg) alloys having been aged at 450 °C for various durations. Cu-8.0Ni-1.8Si alloy: a 15 min; b 60 min; c 300 min. Cu-8.0Ni-1.8Si-0.15Mg alloy: d 15 min; e 60 min; f 300 min
Fig. 6 Bright-field micrographs of microstructural evolutions in Cu-6.0Ni-1.0Si-0.5Al-(0.15Mg) alloys having been aged at 450 °C for various durations. Cu-6.0Ni-1.0Si-0.5Al: a 5 min; b 60 min; c 120 min. Cu-6.0Ni-1.0Si-0.5Al-0.15Mg: d 5 min; e 60 min; f 120 min
Fig. 7 Stress relaxation rate of the studied alloys stress loaded at different temperatures for various durations. a Cu-8.0Ni-1.8Si; b Cu-8.0Ni-1.8Si-0.15Mg; c Cu-6.0Ni-1.0Si-0.5Al; d Cu-6.0Ni-1.0Si-0.5Al-0.15Mg
Fig. 8 Bright-field micrographs of microstructural evolutions in Cu-6.0Ni-1.0Si-0.5Al-0.15Mg alloy samples loaded at different temperatures for different time. a 25 °C/2 h; b 25 °C/20 h; c 25 °C/100 h; d 200 °C/2 h; e 200 °C/20 h; f 200 °C/100 h
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