The structure and mechanical properties of Ti-Fe-B and Ti-Fe-Co-B alloys produced in the shape of the arc-melted ingots of about 25 mm diameter and 10 mm height are studied.
International Nuclear Information System (INIS) This is caused by the formation of the metastable Ni31Si12 phase and NiSi phase during the directional solidification process.Įffect of B addition to hypereutectic Ti-based alloys Moreover, the Ni-Si hypereutectic composites present higher micro-hardness as compared with that of the pure Ni3Si compound. This is proved by the calculation in terms of M-S interface stability criterion. The solid/liquid interface always keeps planar interface no matter how high the solidification rate is increased. The Ni-Si hypereutectic composite is mainly composed of α-Ni matrix, Ni-Ni3Si eutectic phase, and metastable Ni31Si12 phase. Microstructure of the Ni-Si hypereutectic alloy is refined with the increase of the solidification rate. This paper investigates the influence of the solidification rate on the microstructure, solid/liquid interface, and micro-hardness of the directionally solidified Ni-Si hypereutectic alloy. Microstructure and property of directionally solidified Ni-Si hypereutectic alloyĬui, Chunjuan Tian, Lulu Zhang, Jun Yu, Shengnan Liu, Lin Fu, Hengzhi An explanation of the discrepancies observed and complications associated with every technique applied is offered in the paper. None of the techniques can provide a definite value for the solidus temperature, as this is affected by the chosen calculation path for the FactSage analysis and further complicated by evolution of secondary Al-Cu and Mg-Si phases that commenced at the end of solidification. For example, the FactSage computations, in general, resulted in 281 K to 286 K (8 Â☌ to 13 Â☌) higher Al-Si eutectic temperatures than the ones recorded in the thermal analysis, which are also ~278 K (~5 Â☌) higher than those observed in the in situ neutron diffraction. Various techniques applied in this study resulted in some discrepancies in the results. The study revealed kinetics of solid α-Al, solid Si, Al 2Cu, and Mg 2Si evolution, as well as the individual effects of Cu and Mg alloying additions on the solidification path of the Al-Si system.
#Punto de copio de palomar collego software#
2 software package, as well as experimental thermal analysis, and in situ neutron diffraction.
Metallurgical evaluation included thermodynamic calculations of the solidification process using the FactSageâ„¢ 6. This study was performed to evaluate the solidification kinetics for three P-modified hypereutectic Al-19 pct Si alloys: namely, Al-Si binary alloy and with the subsequent addition of 2.8 pct Cu and 2.8 pct Cu + 0.7 pct Mg. Understanding of the kinetics of solid-phase evolution in solidification of hypereutectic aluminum alloys is a key to control their as-cast microstructure and resultant mechanical properties, and in turn, to enhance the service characteristics of actual components. In Situ Study of Microstructure Evolution in Solidification of Hypereutectic Al-Si Alloys with Application of Thermal Analysis and Neutron Diffraction The mechanical properties, such as hardness, high-temperature tensile stress, thermal expansion, and high-temperature relative wear resistance, were estimated using the specimens taken from the liquid-treated diecast products, and the results were compared with those of a conventional metal-mold-cast piston. Jang, Youngsoo Choi, Byounghee Kang, Byungkeun Hong, Chun PyoĪ liquid treatment method by electromagnetic stirring was applied to a hyper-eutectic Al-15wt pctSi-4wt pctCu-3wt pctNi alloy for the piston manufacturing with diecasting process in order to improve high-temperature mechanical properties of the piston heads. Effects of Electromagnetic Stirring on the Microstructure and High-Temperature Mechanical Properties of a Hyper-eutectic Al-Si-Cu-Ni Alloy
0 kommentar(er)
