Effect of in situ TiB2 particle reinforcement on the creep resistance of hypoeutectic Al–12Si alloy

Huang, Minhwa; Li, Xianfeng; Yi, Hongzhan; Ma, Naiheng; Wang, Haowei

doi:10.1016/j.jallcom.2004.07.052

Cited by 49 publications

(29 citation statements)

References 31 publications

(90 reference statements)

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“…3. From the slope of this curve the activation energy for the reaction is calculated to be 176.6 kJ/mol, which is comparable with the activation energy data reported by other workers for Al 3 Ti formations through other processes [5,11,12]. It is marginally higher than activation energy obtained for binary alloy [3].…”

Section: Determination Of N and Esupporting

confidence: 86%

Reaction kinetics studies on Ti-Al-Cr-Nb-B intermetallics

Gupta

Pant

Agarwala

et al. 2009

Trans Indian Inst Met

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In reaction synthesis (RS) route of powder metallurgy, heat of reaction between elemental powders is utilised to obtain intermetallic compounds. Prior to reaction synthesis of quaternary alloy Ti48Al2Cr2Nb (with 10 at. % B), reaction kinetics studies were carried out. Powder mixture was prepared and Differential Scanning Calorimetry (DSC) experiments were carried out at 3 different heating rates. Activation energy and Avrami Index 'n' are obtained by Johnson-Mehl-Avrami (JMA) equation. Formation of Al 3 Ti was confirmed through X-ray diffraction (XRD). Reaction mechanisms are identified in accordance with 'n' values. In the temperature range of 1060-1150K, it proceeds as instantaneous nucleation and three dimensional growth with an activation energy of 176 kJ mole -1 . Theoretical backgroundNotation: D :the reacted fraction, t : time, T : the absolute temperature, R :the gas constant = 8.3143 J/mol/K n :Avrami Index parameter depending on the nucleation mechanism and number of growth dimensions E : the activation energy, A : the pre-exponential factor, E : the heating rateThe reaction rate of a solid-state transformation obeying JMA kinetic model can be written in the following form [6];The above equation is differentiated and equated to zero (d 2 D/dt 2 = 0) for the maximum reaction rate at T m temperature to obtain final equation as follows;ln E/T m 2 = -E/RT m + C1where C1 is a constant.T m is calculated from the DSC plots for all the different heating rates with the assumption that the peak of respective DSC plot for a particular heating rate (E) is the maximum reaction rate point. The plot for ln E/T m 2 versus 1/T m is linear and the slope of this curve is used to calculate the activation energy E.Integration of equation 1 and after taking double natural logarithm and using Doyle's approximation [7]; ln[ln (1/1-D)] = C2 -1.05nE/RT( 3) where C2 is a constant

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Section: Determination Of N and Esupporting

confidence: 86%

Reaction kinetics studies on Ti-Al-Cr-Nb-B intermetallics

Gupta

Pant

Agarwala

et al. 2009

Trans Indian Inst Met

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“…Huang et al [15] found better creep resistance in hypoeutectic Al-Si alloy reinforced with in-situ TiB 2 . Yi et al [16] have shown that the ultimate tensile strength of in-situ composites was higher than that of Al-Si alloy in the temperature range from 25°C to 400°C.…”

Section: Introductionmentioning

confidence: 98%

Effect of Temperature on the Wear Behavior of Al-7Si-TiB2 In-Situ Composites

Kumar

Sarma

Murty

2008

Metall Mater Trans A

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In this article, the effect of temperature and load on the dry sliding wear behavior of an Al-7Si alloy reinforced with in-situ TiB 2 particles is reported. The coefficient of friction and wear rate of Al-7Si alloy and in-situ composites were measured using a high-temperature pin-on-disc apparatus. The wear tests were performed in the temperature range of 100°C to 300°C, at an applied load of 40 to 120 N. With increasing temperature, the wear rate of Al-7Si alloy increased drastically and it decreased with the increase in weight percent of TiB 2 particles. The transition from mild to severe wear for Al-7Si alloy was observed at 80, 60, and 40 N at temperatures of 100°C, 150°C, and 200°C, respectively. The alloy reinforced with 5 wt pct of TiB 2 showed the transition at 120 N and 200°C, and the transition load further decreased to 80 N at 300°C. However, within the present experimental range of load, the addition of 10 wt pct of TiB 2 showed the transition only at 100 N and 300°C. The addition of TiB 2 particles increases the wear resistance properties of Al-7Si alloy even at high temperature.

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“…As a result, the reinforcement effect of the CNTs on the composites is not very outstanding (Kuzumaki, et al, 1998& Laha, et al, 2004& George, et al, 2005. Compared to reinforcements such as Al 2 O 3 (Huang, et al, 2003& Kang, et al, 2004, SiC (Moreno, et al, 2006), TiB 2 (Huang, et al, 2005), aluminum borate whiskers (Zhu & Lizuka, 2003), TiN (Shyua, et al, 2002), and others used for Al matrix composites (Zambona, et al, 2004& Tang, et al, 2003, the strengthening effect of the CNT reinforcement is the strongest ever reported. Table 1.…”

Section: Aluminum Powdermentioning

confidence: 99%