Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 918, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165408
Keywords
Cu-15Ni-8Sn alloy; Yttrium; Cellular precipitation kinetics; Grain growth; Mechanical properties
Categories
Funding
- National Key Research and Development Program of China [2018YFE0306100]
- National Natural Science Foundation of China [52071342, 51901250]
- Aero Engine Corporation of China [HFZL2019CXY016]
- Scientific Research Foundation of Hunan Provincial Education Department [21C0267]
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The addition of yttrium to Cu-15Ni-8Sn alloy affects the grain growth and mechanical properties, resulting in increased strength and hardness.
The effects of yttrium on the cellular precipitation kinetics, grain growth behavior and mechanical properties of Cu-15Ni-8Sn alloy are investigated. Results show that the added yttrium leads to the formation of NiSnY and Ni2Y compounds, which increases the strength, refines the grains and slows the grain growth rate of the Cu-15Ni-8Sn alloy. Also, the addition of yttrium changes the nucleation rate and crystal growth type of the gamma phase, postponing cellular precipitation in the early stages of aging treatment. Compared with the peak-aged Cu-15Ni-8Sn alloy, the peak-aged Cu-15Ni-8Sn-0.2Y alloy possesses higher hardness and strength. The hardness increases from 348 HV to 372.2 HV, the yield strength increases from 960 MPa to 1098 MPa, and the ultimate tensile strength increases from 1044 MPa to 1166 MPa. (C) 2022 Published by Elsevier B.V.
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