کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1576196 | 1514771 | 2013 | 10 صفحه PDF | دانلود رایگان |

The effect of aluminum on the microstructure and properties of Cu–Ni–Si alloys has been investigated using hardness test, electrical conductivity measurement, optical microscopy, X-ray diffraction analysis, scanning electron microscopy and transmission electron microscopy. Compared with Cu–Ni–Si alloy, Cu–Ni–Si–Al alloy had finer grains. After homogenization treatment at 940 °C for 4 h, hot rolling by 80% at 850 °C, solution treatment at 970 °C for 4 h, cold rolling by 50% and ageing treatment at 450 °C for 60 min, properties better than Cu–Ni–Si alloy have been obtained in Cu–Ni–Si–Al alloy: hardness was 343 HV, electrical conductivity was 28.1% IACS, tensile strength was 1080 MPa, yield strength was 985 MPa, elongation percentage was 3.1% and stress relaxation rate was 9.83% (as tested at 150 °C and loading for 100 h). β-Ni3Si and δ-Ni2Si formed during the ageing process and the crystal orientation relationship between matrix and precipitates was : (02̄2̄)Cu(01̄1̄)β(010)δ, [100]Cu[100]β[001]δ; (111̄)Cu(111̄)β(02̄1)δ, [112112]Cu[112112]β[012]δ. Addition of Al promoted the precipitation, and effectively enhanced the anti-stress relaxation property. Quasi-cleavage fracture with shallow dimples appeared in designed Cu–Ni–Si–(Al) alloy.
Journal: Materials Science and Engineering: A - Volume 572, 10 June 2013, Pages 65–74