机械工程材料试题)（Mechanical engineering material examination questions)）.docVIP

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机械工程材料试题)（Mechanical engineering material examination questions)）.doc

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机械工程材料试题)（Mechanical engineering material examination questions)）

机械工程材料试题)（Mechanical engineering material examination questions)） chapter Fill in the blanks: The criterion of 1. commonly used mechanical properties of strength, hardness _ _______ _ _______, _____ plastic ___ and fatigue strength. There are 2. commonly used methods of hardness testing _ Rockwell, Brinell ____ __ ___ __, Vivtorinox ______. 3. hardness of metal materials and the use of different testing methods with different materials, the general Aluminum Alloy using Vivtorinox _____ ___ method, the hard alloy blade adopts ____ Luo ____ method. Two, judgment: 1. GB takes Ak as the toughness criterion. (X) 2., the higher the strength and hardness of the material, the worse its plasticity and toughness. (X) Three, multiple-choice questions: 1. in tensile tests, the maximum stress that a specimen can withstand before breaking off is called material (B) A. yield limit; B tensile strength; C elastic limit Second chapters Fill in the blanks: 1. common types of _ body centered lattice _______, ___ _____, __ close packed face centered ______. 2. according to the solute atoms occupied in the solvent in the lattice position, solid solution can be divided into ____ gap ____ and _ replacement _______. 3. according to the geometry characteristics of crystal defects, which can be divided into ____ point ____, ____ line ____, ___ face three _____. The 4. is a -Fe ______ BCC lattice __ crystal structure, the unit cell atomic number ____2____. Two, judgment: 1., the crystals are anisotropic, while the crystals are isotropic. (X) 2. in polycrystalline materials, the grain boundaries of adjacent grains are called grain boundaries. (V) Three. NOUN explanation: 1 alloy: the fusion of two or more than two metals (or metals or nonmetals) into a material having metallic properties called alloy. 2. phase: Third chapters Fill in the blanks: Methods 1. grain refinement has increased ___ undercooling, _____ ___ modification, _____ __ vibration treatment ______. The grain size of 2. mainly de