10年金属学（10-year metal）.docVIP

10年金属学（10-year metal） 844 South China university of technology 2010 graduate entrance examination for masters degree (please answer on the answer sheet, the answer is invalid on the test paper, and this volume must be returned with the answer sheet.) Subject name: metal Applicable major: material physics and chemistry, material science, material processing engineering, material engineering A total of 4 pages 1. Fill in the blanks (0.5 points per blank, 30 points total) 1. The isomeric transformation of pure iron is: please - 1394 ° C please - 912 ° c. Their crystal structure is different Is,, and. 1394 ~ 912 ℃ of pure iron a original cell The atomic radius r = (denoted by lattice constant a), the number of the atoms has to be equal to The density of. And below 912 ℃ ShiChunTie cell density for, so when a certain quality Pure iron from higher than 912 ℃ cold to below 912 ℃, the volume will be. - 2. Draw (120) crystal surface and [110] crystal direction in a cubic cell. 3. In the cubic crystal system, the {111} crystal faces include four groups of crystal faces. 4. The actual crystallization temperature of pure metal is always below the theoretical crystallization temperature The difference between crystallization temperature and actual crystallization temperature is called. 5. Metal materials working under normal temperature, grain refining, can make metal strength, hardness, plasticity, Toughness. In industrial production, in order to refine the grain of the cast metal, mainly adopt, And so on. 6. The phase structure of binary alloys can be divided into two categories, namely, and. 7. There are three kinds of defects in the actual metal crystal, such as, etc., which are caused by dislocation Lattice distortion can be expressed in... 8. When the liquid metal solidifies, if the non-melting point and the wetting Angle theta =, the particle itself can be As crystal nucleus, the critical nucleation work Δ G = ; If theta is theta is equal to the particle Ready-made surf