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讨论题

选择题和判断题

1、【单选题】下面哪种材料不属于先进材料？

A、Graphene

B、Nanomaterial

C、Steel

D、Semiconductor

2、【多选题】材料可分为哪些类?

A、Metals

B、Ceramics

C、Polymers

D、Composites

3、【多选题】研究材料时应关注以下哪个因素？

A、Microstructure

B、Properties

C、Synthesis

D、Performance

4、【判断题】不同材料里灌装的可乐喝起来一样，所以材料没区别。

A、正确

B、错误

5、【判断题】Property和Performance内涵一样。

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】按照下面电子层的排列顺序，电子的能量逐渐升高。

A、L、M、K、N、O

B、M、N、K、L、O

C、K、L、M、N、O

D、O、N、M、L、K

2、【单选题】Fe的外围电子排布式是？

A、1s22s22p63s23p64s23d6

B、1s22s22p63s23p63d64s2

C、1s22s22p63s23p63d8

D、1s22s22p63s23p63d24s24p2

3、【单选题】核外电子排布的轨道能量，下面错误的是？

A、2s<3s

B、3d<4s

C、3d<4d

D、3s<3p

4、【单选题】Who set up the periodic table?

A、Antoine Lavoisier

B、Johann Wolfgang Doebereiner

C、Julius Lothar Meyer

D、Dmitri Mendeleev

5、【单选题】Which kind of bond in H2O?

A、metallic bond

B、ionic bond

C、covalent bond

D、hydrogen bond

6、【单选题】Which kind of bonding will be mainly existed in ceramics?

A、Covalent bond

B、Metallic bonding

C、Ionic bonding

D、Hydrogen bond

7、【多选题】The following elements are alkali metals.

A、K

B、Na

C、Cs

D、In

8、【多选题】Electrons in atoms would follow these principles.

A、Pauli exclusion

B、lowest energy

C、Hund rule

D、Hooke law

9、【多选题】The following bonds can be treated as weak bonds or secondary bonds.

A、dipole–dipole interactions

B、the London dispersion force

C、hydrogen bonding

D、metallic bonding

10、【判断题】The Pauli exclusion principle is the quantum mechanical principle which states that two or more identical fermions (particles with half-integer spin) can occupy the same quantum state within a quantum system simultaneously.

A、正确

B、错误

11、【判断题】Atoms are made from a nucleus of protons and neutrons and a cloud of electrons.

A、正确

B、错误

12、【判断题】Metal atoms become anions after they lost electrons.

A、正确

B、错误

13、【判断题】When voltage is applied to an ionic material, entire ions must move to cause a current to flow, therefore, the electrical conductivity is very good.

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】What is the coordination number for FCC structure?

A、4

B、8

C、12

D、16

2、【单选题】How many atoms in HCP?

A、2

B、4

C、6

D、8

3、【多选题】For a ceramic compound, what are the characteristics of the component ions that determine the crystal structure?

A、the magnitude of the electrical charge on each ion

B、the number of atoms in ceramic

C、the relative sizes of the cations and anions

D、the weight of atoms in ceramic

4、【多选题】What are molecular structure in polymer?

A、Linear

B、Branched

C、Crosslinked

D、Network

5、【多选题】Which bond can be existed in polymer?

A、Na-Cl

B、C=C

C、C-Cl

D、C=O

6、【判断题】The APF could not be same due to different crystal structure.

A、正确

B、错误

7、【判断题】There are cations and anions in ceramics, therefore, the crystal could not be electrically neutral.

A、正确

B、错误

8、【判断题】The chemical formula of a compound indicates the ratio of cations to anions, which must be stoichiometric.

A、正确

B、错误

9、【判断题】The molecular weight of polymers is a fixed value.

A、正确

B、错误

10、【判断题】A polymer chain is straight.

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】空位原子数的计算公式是哪个？

A、Nv=N.exp(Q/kT)

B、Nv=N.exp(kT/Q)

C、Nv=N.exp(-Q/kT)

D、Nv=N.exp(-kT/Q)

2、【单选题】Which of the following statement is incorrect.

A、点缺陷与材料的电学性质、光学性质、材料的高温动力学过程有关。

B、通常把晶体点阵结构中周期性势场的畸变称为晶体的结构缺陷。

C、点缺陷的类型只包括空位和填隙原子。

D、正常节点没有被原子或离子所占据成为空节点，称为空位。

3、【单选题】Which of the following statement about Frankel's defect is incorrect.

A、空位、填隙原子成对出现，两者数量相等。

B、晶体的体积发生改变。

C、不需要自由表面。

D、正负离子半径相差大时，易形成Frenkel缺陷。

4、【单选题】Which of the following statement about the Burgers vector is incorrect.

A、它的大小表征了位错的单位滑移距离，方向与滑移方向一致。

B、伯氏矢量的大小决定了晶体中何处易出现形成位错以及在外力作用下位错运动的难易程度。

C、刃型位错的伯氏矢量与位错线平行。

D、混合位错的伯氏矢量既不平行也不垂直于位错线，故混合位错由刃型位错与螺旋位错叠加而成。

5、【多选题】点缺陷包含的类型

A、Vacancy

B、Interstitial

C、Dislocation

D、Boundaries

6、【多选题】空位平衡浓度与哪些因素有关？

A、the total number of atomic sites

B、Boltzmann's constant

C、the absolute temperature in Kelvins

D、the energy required for the formation of a vacancy

7、【多选题】Which of the following statements about solid solutions are correct.

A、固溶体是指溶质原子溶入溶剂晶格中而仍保持溶剂类型的合金相。

B、无限固溶体只可能是间隙固溶体。

C、置换固溶体和间隙固溶体都会产生固溶强化现象。

D、形成固溶体后，晶格结构有一定畸变，处于高能量的活化状态，有利于进行化学反应。

8、【多选题】下列属于热缺陷的有：

A、Dislocation

B、Boundary

C、Frenkel defect

D、Schottky defect

9、【多选题】Which of the following statements about dislocation are correct.

A、刃型位错有一个多余半原子面。

B、滑移面必是包含位错线和滑移矢量的平面，在其他面上不能滑移。

C、螺型位错有多余半原子面，原子错排是呈轴对称的。

D、螺型位错会引起晶体体积膨胀。

10、【多选题】Which of the following statement is correct.

A、面缺陷的取向及分布与材料的断裂韧性有关。

B、线缺陷的产生及运动与材料的韧性脆性有关。

C、点缺陷与材料的电学性质、光学性质、材料的高温动力学过程等有关。

D、堆积层错不属于面缺陷。

11、【判断题】所有晶体都包含缺陷。

A、正确

B、错误

12、【判断题】晶体都呈现电中性。

A、正确

B、错误

13、【判断题】Defects do occur alone.

A、正确

B、错误

14、【判断题】杂质原子加入金属中将会导致形成固溶体或者第二相。

A、正确

B、错误

15、【判断题】螺型位错位错线垂直于伯格斯矢量。

A、正确

B、错误

16、【判断题】刃型位错的位错线不一定是直线。

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】在菲克第一定律中D 的含义是什么？

A、diffusion coefficient

B、concentration gradient

C、concentration profile

D、diffusion flux

2、【单选题】渗碳层中碳浓度分布函数是？

A、C=CS－(CS－C0)erf(x/2√DT)

B、C=CS－(CS－C0)erf(x/√DT)

C、C=CS－(C0－CS)erf(x/2√DT)

D、C=CS－(C0－CS)erf(x/√DT)

3、【单选题】A plate of iron is exposed to a carburizing (carbon-rich) atmosphere on one side and a decarburizing (carbon-deficient) atmosphere on the other side at 700°C. If a condition of steady state is achieved, calculate the diffusion flux of carbon through the plate if the concentrations of carbon at positions of 5 and 10mm (5x10-3 and 10-2 m) beneath the carburizing surface are 1.2 and 0.8 kg/m3, respectively. Assume a diffusion coefficient of 3x10-11m2/s at this temperature.

A、2.4 x 10-8 kg /m2·s

B、2.4 x 10-9 kg /m2·s

C、2.4 x 10-10 kg /m2·s

D、2.4 x 10-11 kg /m2·s

4、【多选题】What are the factors that influence the diffusion?

A、分子间作用力

B、温度

C、浓度梯度

D、晶体结构

5、【多选题】扩散机理可分为哪些？

A、vacancy diffusion

B、self-diffusion

C、impurity diffusion

D、interstitial diffusion

6、【多选题】扩散系数与哪些因素有关？

A、absolute temperature

B、concentration gradient

C、the activation energy for diffusion

D、the gas constant

7、【判断题】The vacancy is in the same direction as the atom.

A、正确

B、错误

8、【判断题】空位扩散的速度要快于填隙扩散的速度。

A、正确

B、错误

9、【判断题】Nonsteady-state diffusion means that the diffusion particle concentration distribution does not change with time.

A、正确

B、错误

10、【判断题】扩散系数只取决于晶体结构。

A、正确

B、错误

11、【判断题】Solid-state diffusion is a means of mass transport within solid materials by stepwise atomic motion.

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】韧度是衡量材料韧性大小的力学性能指标，是指材料断裂前吸收( )的能力。

A、Plastic deformation work and fracture work

B、Elastic deformation work and plastic deformation work

C、Elastic deformation work and fracture work

D、Plastic deformation work

2、【单选题】对于脆性材料,其抗压强度一般比抗拉强度（ ）。

A、High

B、Low

C、Equal

D、Uncertain

3、【单选题】金属疲劳的判断依据是( )。

A、Strength

B、Plastic

C、Tensile strength

D、Fatigue strength

4、【单选题】常用的塑性判断依据是( )。

A、Elongation after fracture and section shrinkage

B、Plastic and toughness

C、Section shrinkage and plasticity

D、Thermal expansion

5、【判断题】The internal force concentration caused by internal force is called stress.

A、正确

B、错误

6、【判断题】The stress distribution on the notch section is uniform.

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】形变强化是材料的一种特性， 是( )阶段产生的现象。

A、Elastic deformation

B、Impact deformation

C、Uniform plastic deformation

D、Yield deformation

2、【单选题】以下哪个是增强技术遵循的准则?

A、Restricting and hindering dislocation motion renders a material harder and stronger.

B、Restricting and hindering dislocation motion decreases the hardness of a material.

C、Restricting and hindering dislocation motion are not related to the hardness of a material.

D、Restricting and hindering dislocation motion are not related to the toughness of a material.

3、【单选题】哪种晶界能有效阻止滑移并且增加材料强度?

A、small-angle grain boundaries

B、twin boundaries

C、big-angle grain boundaries

D、large grains

4、【单选题】当杂质原子出现时，对滑移的抵抗力会( )。

A、Increase

B、Decrease

C、stay same

D、hard to say

5、【单选题】纯金属重结晶过程相比于合金重结晶过程会( )。

A、more slowly

B、at same speed

C、more rapidly

D、hard to say

6、【单选题】晶核生长必须有以下哪些步骤?

A、Recovery

B、Recrystallization

C、both are not need

D、both are needed

7、【单选题】随着晶核生长 渝粤教育 ，所有的晶界区域会( )。

A、increase

B、decrease

C、unchanged

D、hard to say

8、【多选题】金属颗粒尺寸可能对下列哪些物质有影响?

A、Strength

B、Toughness

C、Hardness

D、Plasticity

9、【多选题】金属的位错密度会被以下哪些影响?

A、Transmittance

B、Ductility

C、Deformation

D、cold work

10、【多选题】重结晶过程中，力学性能会发生什么改变?

A、Harder

B、Weaker

C、more 成人学历 ductile

D、softer

11、【判断题】The combination of the slip plane and the slip direction is called the slip system. The less the slip system, the better the plasticity of the metal.

A、正确

B、错误

12、【判断题】High yield strength is beneficial to material cold forming and welding performance improvement.

A、正确

B、错误

13、【判断题】Plastic deformation is permanent.

A、正确

B、错误

14、【判断题】A screw dislocation may be thought of as resulting from shear distortion.

A、正确

B、错误

15、【判断题】For a screw, the dislocation line motion is parallel to the stress direction.

A、正确

B、错误

16、【判断题】The grain boundaries usually do not come apart or open up.

A、正确

B、错误

17、【判断题】During plastic deformation, slip or dislocation motion may not take place across a common grain boundary.

A、正确

B、错误

讨论题

选择题和判断题

1、【单选题】What is helpful in predicting phase transformation?

A、Phase diagrams

B、Theoretical analysis

C、The microstructure

D、The performance of materials

2、【单选题】Possibly the easiest type of binary phase diagram to understand and interpret is that which is characterized by the________system.

A、钴-镍

B、铁-碳

C、铜-锌

D、镁-铝

3、【单选题】The first step in the determination of phase compositions is to ( ).

A、locate the pressure

B、locate the important point of the diagram

C、locate the temperature

D、determine the tendency of the diagram

4、【单选题】We can find _______single-phase regions in the copper-silver diagram.

A、One

B、Two

C、Three

D、Four

5、【单选题】In the BCC α ferrite, the maximum solubility is _____ wt% at 727℃.

A、0.022

B、0.76

C、2.14

D、6.70

6、【单选题】The maximum solubility of carbon in austenite, 2.14 wt%, occurs at___℃.

A、1394

B、1147

C、1493

D、727

7、【单选题】The time necessary for the transformation to begin and then end depends on ( ).

A、Pressure

B、reaction time

C、temperature

D、reaction process广东开放大学 u.com" title="渝粤题库">渝粤题库 p>

8、【单选题】The thickness ratio of the ferrite and cementite layers in pearlite is approximately ( ).

A、8 to 1

B、6 to 1

C、5 to 1

D、4 to 1

9、【单选题】贝氏体的微观结构由______和______组成。

A、ferrite and cementite

B、austenite and ferrite

C、austenite and cementite

D、ferrite and pearlite

10、【多选题】自由能主要由哪些因素决定？

A、Temperature

B、Pressure

C、Composition

D、Volume

11、【多选题】For a binary system of known composition and temperature, that is at equilibrium, at least three kinds of information are available.

A、The phase that are present

B、The compositions of these phases

C、The percentage of fractions of the phases

D、The mechanical property of the phases present

12、【多选题】The form of iron-carbon phase can be divided into ( ).

A、Ferrite

B、Austenite

C、Cementite

D、Graphite

13、【多选题】The microstructure that develops in iron-carbon alloys depends on ( ).

A、carbon content

B、pressure

C、heat treatment

D、process

14、【判断题】Every pure material is considered to be a phase.

A、正确

B、错误

15、【判断题】Sugar-water syrup solution and solid sugar are different phases.

A、正确

B、错误

16、【判断题】When two phases are present in a system, it is necessary that there will be a difference in both physical and chemical properties.

A、正确

B、错误

17、【判断题】From the previous example for the 60 wt%Ni-40 wt% Cu alloy at 1100℃, only the α phase is present.

A、正确

B、错误

18、【判断题】We don’t have to employ the tie line if two phases are present.

A、正确

B、错误

19、【判断题】For all temperatures and compositions below the melting temperature of the lowest melting component, only a single solid phase will exist.

A、正确

B、错误

20、【判断题】Of all binary alloy systems, the one that is possibly the most important is that for iron and carbon.

A、正确

B、错误

21、【判断题】α iron has a BCC crystal structure.

A、正确

B、错误

22、【判断题】In practice, not all steels and case irons have carbon contents less than 6.7 wt% C.

A、正确

B、错误

23、【判断题】δ-ferrite is stable only at relatively high temperatures.

A、正确

B、错误

24、【判断题】The first process to accompany a phase transformation is nucleation.

A、正确

B、错误

25、【判断题】Temperature plays an important role in the rate of the austenite-to-pearlite transformation.

A、正确

B、错误

26、【判断题】In the iron-carbide phase diagram, when at the temperatures above the eutectoid and for all times, only austenite will exist.

A、正确

B、错误

27、【判断题】Martensite will appear on the iron-iron carbide phase diagram.

A、正确

B、错误

28、【判断题】Cementite is much harder but more brittle than ferrite.

A、正确

B、错误