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Unformatted text preview: (a) 100% coarse pearlite. (b) 100% tempered Martensite. (c) 50% coarse pearlite, 25% bainite, and 25% Martensite. 3 Introduction to Materials Science 11.29 Cite two reasons why martensite is so hard and brittle. 11.40 What is the principal difference between natural and artificial aging processes? 11.D8 (D9) A solution heat-treated 2014 aluminum alloy is to be precipitation hardened to have a minimum tensile strength of 450 MPa and a ductility of at least 15%EL. Specify a practical precipitation heat treatment in terms of temperature and time that would give these mechanical characteristics. Justify your answer. 4...
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- Spring '10