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A technical article describing the kinds of alloys found in jet engines. These alloys are sloughed off by the engines during flight and land on areas beneath the flight path.

When bonding two pieces of metal, either the metals must melt a bit where they meet or some molten metal must be introduced between the pieces. A solid bond then forms when the metal solidifies again. But researchers at MIT have found that in some situations, melting can actually inhibit metal bonding rather than promote