At zero level temperature of copper alloys, they become very hard and brittle in nature.(a) True(b) FalseThis question was addressed to me in unit test.My enquiry is from Copper Alloys topic in section Foundry Introduction & Materials of Casting-Forming-Welding II

At zero level temperature of copper alloys, they become very hard and

1.	At zero level temperature of copper alloys, they become very hard and brittle in nature.(a) True(b) FalseThis question was addressed to me in unit test.My enquiry is from Copper Alloys topic in section Foundry Introduction & Materials of Casting-Forming-Welding II
Answer» The correct answer is (b) False To explain I would say: At ZERO level TEMPERATURE of copper ALLOY castings, no any kind of embrittlement occurs; in FACT, the tensile STRENGTH of copper castings enhances at low temperature. Therefore, the copper castings can be used at very low temperatures without any significant changes to the properties of the castings.

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