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Influence of the nature of microconstituents on the tensile properties of a zinc-based alloy and a leaded-tin bronze at different temperatures and strain rates.
No full textAn attempt has been made to study the influence of the nature of microconstituents, strain\ud
rate and test temperature on the tensile properties of a zinc-based alloy (ZA 27). The\ud
properties of the alloy have been compared with those of a (leaded-tin) bronze (SAE 660)\ud
under similar test conditions. In the latter case, one of the phases (lead) has rather poor\ud
compatibility with the matrix. Properties such as hardness, density and electrical\ud
conductivity of the alloys have also been measured. The microstructure of the zinc-based\ud
alloy revealed primary a-dendrites surrounded by the eutectoid a#g in the interdendritic\ud
regions. The metastable e phase was also present. The bronze revealed primary a-dendrites\ud
together with the CuÐSn intermetallic in the interdendritic regions. Discrete particles of lead\ud
were also observed in the microstructure of the bronze. Increasing test temperature caused\ud
a reduction in the ultimate tensile strength (UTS) and an increase in the ductility of the alloys,\ud
the zinc-based alloy being much more influenced than the bronze. Higher strain rates\ud
revealed improved strength and percentage elongation in which the zinc-based alloy was\ud
once again influenced more than the bronze. A comparison of the tensile properties revealed\ud
the UTS of the zinc-based alloy to be higher than that of the bronze at lower test\ud
temperatures while the trend reversed at higher temperatures. However, the percentage\ud
elongation of the former was always higher. Tensile fractured surfaces revealed the\ud
occurrence of material failure by a mixed mode, i.e. ductile and brittle type. The bronze\ud
specimens exhibited microcracking along the lead/matrix interfacial regions at low test\ud
temperatures. Fracture of lead was also observed in this case. However, this tendency was\ud
somewhat suppressed at higher test temperatures. The contribution of ductile fracture in the\ud
case of the zinc-based alloy was more than the bronze in general, whose extent increased at\ud
higher test temperatures. Coarsening of the dimples was another observation made at\ud
elevated test temperatures in the case of the zinc-based alloy. The behaviour of the alloys\ud
has been explained in terms of their microstructural and fractographic features. An attempt\ud
has also been made to understand the mechanisms of material failure
Dry Sliding Wear Behaviour of Zinc-Based Alloy: Influence of Heat Treatment and Sliding Speed and Pressure
No full textProtection of bamboo surfaces by CNSL based coatings.
No full textSurface coatings based on CNSL were prepared from formaldehyde, styrene, hexamine and epichlorohydrin- for the protection of bamboo surfaces. CNSL based coatings were applied on bamboo and the performance of these coatings was evaluated by accelerated and chemical resistance tests. It was observed that these coatings can be used for the protection of bamboo from corrosive environments
Effects of silicon addition and test parameters on the sliding wear characteristics of zinc-based alloy containing 37.5% aluminium.
No full textThis study describes a few observations pertaining to the effects produced through the addition of silicon on the tensile and compressive properties and sliding wear response of a zinc-aluminium alloy. The influence of test temperature on the tensile (strength and elongation) properties and sliding speed and pressure on the sliding wear behaviour of the alloys has also been examined. The nature of different microconstituents of the alloys has been taken as a base to explain the characteristics of the specimens. The study shows that addition of silicon to the alloy system becomes beneficial under test conditions involving higher operating temperatures while the trend reverses at low temperatures. The former has been attributed to the thermal stability attributed by the element at elevated temperatures. On the contrary, the predominating microcracking tendency introduced in the alloy system by the element (silicon) leads to inferior properties under low temperature conditions. Moreover, the lubricating and load bearing capabilities of phases like α and η become effective towards improving the response of the silicon-free alloy under low temperature conditions only and their positive effects cannot be realized at high temperatures in view of (their) low melting points. Thus, addition of silicon becomes helpful under specific conditions only
Surface engineering A potential technique for improving the performance of mining and agricultural implements .
No full textProperty improvement in Al–Si alloys through rapid solidification processing
No full textThis paper reports the findings of the microstructural and tensile properties in rapidly solidified and extruded Al–Si alloys with and without ternary addition of copper, as compared to conventionally cast alloys of the same composition. An attempt has been made to correlate the fractographic findings with the microstructure of the alloys
