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# Two pieces being joined and the temperature is raised

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Unformatted text preview: h there is no matter. a is a geometric factor and E is a material property known as Young’s modulus. where Bragg’s law The deﬁning equation of X-ray Young’s modulus is a measure of the resistance of the material to relative atomic separa2 the force diffraction, slope of d sin . curve at the equilibrium separation tion (stiffness). The steeper then distance (i.e., the higher the value of E), the greater the force required to move the atoms brazing A process of joining two materials in which a from their equilibrium positions. Thus, materials with large values of E are stiff, since low-temperature ﬁller metal is sandwiched between the they are better able to resist changes in length under applied loads. two pieces being joined and the temperature is raised ....................................................................................................................................... to sufﬁciently to melt the ﬁller metal but not high enough EXAMPLE 2.5–1 melt the materials are being Figure 2.5–1. If identically shaped beams The bond-force curves for two materials shown in joined. were fabricated from each material, which would show a greater deﬂection under equal applied brittle Term used to describe materials that are unable loads? to absorb energy by “bending” but instead fracture (break into pieces) when subjected to external loads. For example, the glass in a car window is brittle, while the metal or plastic bumper is not. More precisely,Contents | | e-Text Main Menu | Textbook Table of brittle materials exhibit a low failure strain. Burgers circuit A circuit drawn around a dislocation through defect-free material that would normally close if there were no dislocation inside of the circuit. Burgers vector b The vector that joins the end to the start of the Burgers circuit. The Burgers vector is an invariant property of a dislocation. carbon-carbon composites Composites in which cementite An iron carbide phase, Fe ceramic-matrix composites Compo ceramics are used as the matrix materi chemical vapor deposition (CVD) A tw...
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