Effects of solidification parameters on microstructure and mechanical properties of continuous columnar-grained Cu-Al-Ni alloy

Content Provider	Semantic Scholar
Author	Wang, Zhen Liu, Xue-Feng Xie, Jian-Xin
Copyright Year	2011
Abstract	Abstract Effects of melt temperature and casting speed on microstructure and mechanical properties of Cu-14%Al-3.8%Ni (mass fraction) alloy wires fabricated by continuous unidirectional solidification technology were investigated. It was found that the average size of columnar grain in the alloy decreased and grain boundary turned clear and straight with increasing the casting speed at a given melt temperature. When the melt temperature was up to 1 280 °C, the β 1 phase gradually transformed into lozenged and lanciform γ 1 ' martensite, as well as parallel-sided plate β 1 ' martensite. The alloy with numerous coarsely dendritic γ 2 phase has poor mechanical properties due to the difficulty of stress-induced martensitic transformation. When the amount of the γ 2 phase reduced and the coarse dendrite γ 2 phase evolved into the fine square particles, the elongation of the alloy increased gradually with a decrease in tensile strength. Meanwhile, the plasticity of the alloy could also be improved by increasing the amount and size of martensites, particularly the lanciform γ 1 ' martensite. When the alloy was almost composed of coarse lanciform γ 1 ' martensite, the tensile strength and elongation of the alloy could be up to 772 MPa and 18.9%, respectively, and the tensile curve consisted of three transformation platforms.
Starting Page	368
Ending Page	374
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1016/S1002-0071(12)60071-9
Alternate Webpage(s)	https://core.ac.uk/download/pdf/82267258.pdf
Alternate Webpage(s)	https://doi.org/10.1016/S1002-0071%2812%2960071-9
Volume Number	21
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article