Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 27, Issue 9, Pages 1947-1955Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(17)60219-X
Keywords
Cu-15Ni-8Sn-0.3Nb alloy; powder metallurgy method; hot extrusion; aging treatment; spinodal decomposition; microstructure; mechanical properties
Categories
Funding
- National Key Research and Development Program of China [2016YFB0301400]
- General Armaments Department of China [9140A12040515QT48167]
- Innovation-driven Plan of Central South University, China [CSU20151024]
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Cu-15Ni-8Sn-0.3Nb alloy rods were prepared by means of powder metallurgy followed by hot extrusion. Element maps obtained by electron probe micro analyzer (EPMA) showed that Nb-rich phases were formed and distributed within grains and at grain boundaries of the Cu-15Ni-8Sn-0.3Nb alloy. Transmission electron microscope (TEM) results indicated that there was no obvious orientation relationship between these phases and the matrix. Spinodal decomposition and ordering transformation appeared at early stages of aging at 400 degrees C and caused significant strengthening. Cu-15Ni-8Sn-0.3Nb alloy exhibited both higher strength (ultimate tensile strength > 1030 MPa) and higher tensile ductility (elongation>9.1%) than Cu-15Ni-8Sn alloy after aging treatment. The improvement was caused by Nb-rich phases at grain boundaries which led o the refinement of grain size and postponed the growth of discontinuous precipitates during aging.
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