The Effect of Solidification on Acoustical of Tin Bronze 20Sn Alloy

This study was designed to determine the effect of the solidification rate on the acoustic properties of the bronze alloy of 20% wt. Sn. Copper and commercially pure tin is melted in a furnace to a temperature 1000, 1100 and 12000C. The melted metal is poured into molds variation temperature of 200, 300 and 4000C. Materials castings were cut and machined for specimen damping capacity test. The results showed that the reduction in mold temperature leads to an increase solidification rate, which causes the shortness of the solidification time. The variation of the solidification rate affects on the morphology of the microstructure and acoustical properties of the material. By increasing the solidification rate influence on the secondary dendrite arm spacing (SDAS) decreases. It causes the material hardness increases and the damping capacity of material decreases. There is a significant correlation between the material hardness and the damping capacity of materials.

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The Study of Dendrite Arm Spacing (DAS) on Acoustical of Tin Bronze 20Sn Alloy as Gamelan Bali Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.889.133 ◽

2017 ◽

Vol 889 ◽

pp. 133-137

Author(s):

I. Ketut Gede Sugita ◽

I. Gusti Ngurah Priambadi

Keyword(s):

Solidification Rate ◽

Casting Process ◽

Mold Temperature ◽

Casting Temperature ◽

Important Process ◽

Acoustical Characteristic ◽

Dendrite Arm Spacing ◽

Tin Bronze ◽

Crucible Furnace ◽

The Difference

Bronze especially tin bronze is mostly used as material of traditional music instrument such as gamelan, cymbals, or bells. Casting process becomes an important process in making gamelan. Solidification is the most important process in the casting. This study is designed to evaluate variant of solidification rate on casting process of conventional bronze (tin bronze) as gamelan material. This study aimed at finding variant of Dendrite Arm Spacing (DAS) on acoustical characteristic of bronze alloy. The alloy of Cu–20Sn is chosen as the composition of tin-bronze because this composition is widely used as the gamelan material. Variant of solidification rate is designed by varying mold temperature and casting temperature. The bronze is melted in crucible furnace until 1050, 1100, 1100oC. Then, the melted material was poured into the mold in 400°C temperature. This study showed that increase of casting temperature influence the decrease of solidification rate which affecting the longer time of solidification. The difference of solidification rate affected on the construction of micro structure and the dendrite (DAS) formed. The size of the dendrite forms affected the mechanical and acustical tin bronze.

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Effects of Macroscopic Pores on the Damping Behaviors of Metal Materials

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.1155 ◽

2011 ◽

Vol 66-68 ◽

pp. 1155-1162

Author(s):

Jian Ning Wei ◽

Gen Mei Li ◽

Li Ling Zhou ◽

Xue Yun Zhou ◽

Jian Min Yu ◽

...

Keyword(s):

Internal Friction ◽

Pure Aluminum ◽

Air Pressure ◽

Damping Capacity ◽

Infiltration Process ◽

Pressure Infiltration ◽

Temperature Range ◽

Commercially Pure ◽

Damping Behavior ◽

Metal Materials

A large number of macroscopic pores were introduced into commercially pure aluminum (Al) and Zn-Al eutectoid alloy by air pressure infiltration process to comparatively study the influence of macroscopic pores on the damping behaviors of the materials. Macroscopic pores size are on the order of a millimetre (0.5~1.4mm) and in large proportions, typically high 76vol.%. The damping behavior of the materials is characterized by internal friction (IF). The IF was measured on a multifunction internal friction apparatus (MFIFA) at frequencies of 0.5, 1.0 and 3.0 Hz over the temperature range of 25 to 400 °C, while continuously changing temperature. The damping capacity of the metal materials is shown to increase with introducing macroscopic pores. Finally, the operative damping mechanisms in the metal materials with macroscopic pores were discussed in light of IF measurements.

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Strengthening and toughening strategies for tin bronze alloy through fabricating in-situ nanostructured grains

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2014.10.034 ◽

2015 ◽

Vol 66 ◽

pp. 60-66 ◽

Cited By ~ 31

Author(s):

Xiaohua Chen ◽

Zidong Wang ◽

Ding Ding ◽

Hao Tang ◽

Lili Qiu ◽

...

Keyword(s):

Bronze Alloy ◽

Tin Bronze

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The influence of mold temperature on the fit of cast crowns with commercially pure titanium

Brazilian Oral Research ◽

10.1590/s1806-83242005000200012 ◽

2005 ◽

Vol 19 (2) ◽

pp. 139-143 ◽

Cited By ~ 6

Author(s):

Wagner Sotero Fragoso ◽

Guilherme Elias Pessanha Henriques ◽

Edwin Fernando Ruiz Contreras ◽

Marcelo Ferraz Mesquita

Keyword(s):

Pure Titanium ◽

Mold Temperature ◽

Commercially Pure Titanium ◽

Mechanical Grinding ◽

Marginal Fit ◽

Commercially Pure ◽

Cp Ti

Commercially pure titanium (CP Ti) has been widely applied to fabricate cast devices because of its favorable properties. However, the mold temperature recommended for the manufacture of casts has been considered relatively low, causing inadequate castability and poor marginal fit of cast crowns. This study evaluated and compared the influence of mold temperature (430°C - as control, 550°C, 670°C) on the marginal discrepancies of cast CP Ti crowns. Eight bovine teeth were prepared on a mechanical grinding device and impressions were used to duplicate each tooth and produce eight master dies. Twenty-four crowns were fabricated using CP Ti in three different groups of mold temperature (n = 8): 430°C (as control), 550°C and 670°C. The gap between the crown and the bovine tooth was measured at 50 X magnification with a traveling microscope. The marginal fit values of the cast CP Ti crowns were submitted to the Kruskal-Wallis test (p = 0.03). The 550°C group (95.0 µm) showed significantly better marginal fit than the crowns of the 430°C group (203.4 µm) and 670°C group (213.8 µm). Better marginal fit for cast CP Ti crowns was observed with the mold temperature of 550°C, differing from the 430°C recommended by the manufacturer.

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Influence of Thermodynamic Nonequilibrium on the Acoustic Properties of Gases

International Journal of Aeroacoustics ◽

10.1260/1475472054771411 ◽

2005 ◽

Vol 4 (3) ◽

pp. 373-383 ◽

Cited By ~ 5

Author(s):

Nonna E. Molevich ◽

Anatoly I. Klimov ◽

Vladimir G. Makaryan

Keyword(s):

Acoustic Properties ◽

Theoretical Studies ◽

Dispersion Coefficients ◽

Acoustical Properties ◽

Nonequilibrium Gas ◽

Gas Plasma ◽

Experimental And Theoretical Studies

This paper is a brief review of results of experimental and theoretical studies in the field of acoustics of nonequilibrium gas-plasma media. New acoustical properties of nonequilibrium media caused by the change in sign of the second viscosity and the dispersion coefficients are considered. Such media are acoustically active. Conditions are discussed for generating new nonlinear acoustical structures.

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