材料导论(北京化工大学) 中国大学mooc慕课答案2024版 m101446

Module 1 Introduction Module 1 Quiz

1、 According to American Society for Testing Materials, materials are___.

答案: these substances having properties that make them useful in structures, machines, devices, products, and systems

2、 The term of ______ describes the behavior of materials when subjected to some external force or condition.

答案: properties

3、 Materials engineering involves, on the basis of ______ correlations, designing or engineering the structure of a material to produce a predetermined set of properties.

答案: structure–property

4、 MSE involves the generation and application of knowledge relating_to their_____ and uses, having interdisciplinary and multidisciplinary characteristics.

答案: composition, structure and processing of materials, properties

5、 _is the primary selection criterion that will determine the final choice of materials.

答案: Cost

6、 _____means that a material, after completing its life cycle in one component, could be reprocessed, could re-enter the materials cycle, and could be re-used in another component.

答案: Recyclable

7、 The smart materials have the ability to respond to______.

答案: the environmental changes

8、 In the materials cycle, which of the following issues should we consider

答案: Sustainability;
Biodegradability;
Recyclability

9、 Design for assembly reflects a new concept for disposing of products after their useful life.

答案: 错误

10、 Design for disassembly emphasizes easy product assembly by robots and other automated equipment.

答案: 错误

11、 The term of ______ describes the behavior of materials when subjected to some external force or condition.

答案: property

12、 Materials engineering involves, on the basis of ______ correlations, designing or engineering the structure of a material to produce a predetermined set of properties.

答案: structure–property

13、 The four components involved in the discipline of materials science and engineering
include _____.

答案: processing, structure, properties, and performance

14、 In selecting a material for a specific application, which of the following issues should be considered

答案: Cost;
Availability;
Processability;
Recyclability

15、 According to American Society for Testing, materials are__ .

答案: the matter of the universe;
these substances having properties that make them useful in structures, machines,
devices, products, and systems

16、 Life cycle analysis is used to improve the environmental performance of products.

答案: 正确

17、 Disposal/recycle is the key stage to ensure the last stage to become the first stage ofthe materials cycle.

答案: 正确

18、 The structure of a material depends on how it is processed, and a material’s performance is a function of its properties.

答案: 正确

19、 _____means that a material, after completing its life cycle in one component, could be reprocessed and re-used in another component, then re-enter the materials cycle again.

答案: Recyclable material

20、 ____ is a concept that places recycling at the beginning or design stage of the materials cycle to ensure that waste going into municipal landfills will be minimized.

答案: design for disassembly

21、 Materials are___.

答案: the matter of the universe;
these substances having properties that make them useful in structures, machines,
devices, products, and systems.

22、 Design for assembly emphasis easy product assembly by robots and other automated equipment

答案: 正确

Module 2 Structure of Materials Module 2 Quiz

1、 The key word to describe the nature of covalent bond is of electrons

答案: sharing

2、 Which of the following statement about hydrogen bonding is NOT correct

答案: The strongest of the Primary bonding

3、 Amorphous solids have only order in the arrangement of constituent particles

答案: short-range

4、 lattice parameters are used to describe a unit cell

答案: Six

5、 Which of the following crystal system has lattice parameters of a=b1c; a=b=90°, g=120°

答案: Hexagonal crystal

6、 If the unit cell contains an identical component in the center of the cube in addition to those at the corners of the cube, then it is called___

答案: Body Centered Cubic

7、 The ability of an element to exist in different space lattices is called

答案: allotropy

8、 When impurity atoms replace the host atoms, it is called a/an solid solution

答案: Substitutional

9、 In Polymers, bonds inside the long chain molecules are secondary bonding, bonds among the chains are covalent bonding

答案: 错误

10、 Long range order means the orderly arrangement of atoms extends throughout the entire material.

答案: 正确

11、 If you cool molten metal at extremely rapid rate, amorphous metal can form

答案: 正确

12、 Both Face-centered cubic and Hexagonal Close-packed are close-packed crystal structures

答案: 正确

13、 Because of allotropy, steel can be produced from iron

答案: 正确

14、 In brass, an alloy of Copper and Zinc, Zinc atoms replace Copper atoms to form an interstitial solid solution

答案: 错误

15、 Theexistenceof point defects，impurity atoms, dislocations，grain boundary may all hinder the dislocation movement, hence weaken the materials

答案: 错误

16、 The key word to describe the nature of ionic bond is of electrons

答案: transferring

17、 When impurity atoms are found in the voids or interstices among the host atoms, it is called a/an solid solution.

答案: Interstitial

18、 Which one is the curve that represents the temperatures at which solidification begins

答案: Liquidus

19、 Primary bonding is the forces within a molecule, while secondary bonding is the forces between molecules

答案: 正确

20、 In a (an) dislocation, an extra plane of atoms is inserted into part of the crystal lattice

答案: edge

21、 If the unit cell contains an identical component in the center of the cube in addition to those at the corners of the cube, then it is called___

答案: Body Centered Cubic

Module 3 Properties of Materials Module 3 Quiz

1、 Which statement is correct

答案: Some materials do not have clear yield point.

2、 _____is defined as a sudden application of a load confined to a localized area of a material.

答案: Impact

3、 After a certain amount of time has elapsed under constant load, the creep strain (plastic deformation) will ______.

答案: increase

4、 The__ the heat capacity, the___ the amount of heat needed to produce a temperature change.

答案: larger, greater

5、 What are correctfor describing off-set yield strength

答案: It is the lowest stress at which a limited amount of plastic deformation occurs.;
If a plastic strain of 0.002 in./in. can be tolerated, the stress that produces this strain is designated asthe yield strength of the material at 0.2% offset.

6、 Which statements are correct

答案: The area under which the straight-line portion (elastic region) of the stress-strain curve is modulus of resilience.;
Modulus resilience is a measure of the energy per unit volume that the material can absorb without plastic deformation.;
Resilience tells you the capacity of a material to adsorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered.

7、 Which of the following statements are correct

答案: The greater the modulus, the stiffer the material.;
The stiffer the material, the higher the resistance of the material to deformation.;
The higher the magnitude of elastic modulus, the higher the magnitude of the inter-atomic bonding forces in a material.

8、 Which of the experiments are used for measuring toughness

答案: Charpy impact test;
Izod impact test

9、 Whatare the methods of applying load in a fatigue test

答案: Repetitious Stress;
Reversal Stress

10、 What arethe typical methods for penetration testing of hardness

答案: Brinell Hardness;
Vickers Hardness;
Rockwell Hardness

11、 For electrochemical corrosion, the cell consists of four basic components: , , , and an external conducting connection between anode and cathode

答案: Anode;
Cathode;
Electrolyte

12、 Ductile materials can stand large plastic deformation without fracture.

答案: 正确

13、 Materials with high elastic modulus are typically soft.

答案: 错误

14、 Toughness is the ability or capacity of a material to absorb energy during elastic deformation.

答案: 错误

15、 A ductile material will be ductile forever.

答案: 错误

16、 The maximum stress that can be sustained for a specified number of cycles without fracture is called fatigue limit.

答案: 错误

17、 Many nonferrous metals, such as aluminum and other non-ferrous metals exhibit no fatigue limit.

答案: 正确

18、 Creep happens at specific temperatures.

答案: 错误

19、 Higher stress or higher temperature reduces the rupture time and decreases the creep rate.

答案: 错误

20、 A material with high bonding energy has low thermal expansion coefficient.

答案: 正确

21、 Which statement is correct

答案: Some materials do not have clear yield point.

22、 _____is defined as a sudden application of a load confined to a localized area of a material.

答案: Impact

23、 After a certain amount of time has elapsed under constant load, the creep strain (plastic deformation) will ______.

答案: increase

24、 What are correctfor describing off-set yield strength

答案: It is the lowest stress at which a limited amount of plastic deformation occurs.;
If a plastic strain of 0.002 in./in. can be tolerated, the stress that produces this strain is designated as the yield strength of the material at 0.2% offset.

Module 4 Metalic Materials Module 4 Quiz

1、 All alloys that are not______ based, are called nonferrous metals

答案: Iron

2、 Which of the following do not belong to non-ferrous metal

答案: Stainless steel

3、 Cast iron can be classified into four categories: gray cast iron, white cast iron, nodular cast iron and ______ cast iron

答案: Malleable

4、 Most cast irons have a chemical composition of ______ percent carbon

答案: 2.5–4.0

5、 The predominant alloying element in stainless steel is ______, which concentration should be higher than 11 wt%.

答案: Chromium

6、 ______ is one of the principal alloying elements in stainless steels, and one major constituent in superalloys.

答案: Nickle

7、 Metals are good conductors of both__

答案: Electricity and heat

8、 are NOT made with a P/M process.

答案: White metals

9、 Which is NOT involved in the general PM production steps.

答案: Cold work

10、 ______ is believed “the most glamorous metal in the world”

答案: Titanium

11、 Al-Li alloys not only have a very high , but also have excellent fatigue and low-temperature toughness properties.

答案: Specific strength

12、 According to the composition, metal alloys are grouped into two classes:_, and_metals

答案: Ferrous;
Nonferrous

13、 Stainless steels are divided into three classes on the basis of the predominant phase constituent of the microstructure:_,_, or__

答案: Martensitic;
Ferritic;
Austenitic

14、 uses cooling in still air？

答案: Stress relief annealing;
Normalizing

15、 Some general corrosion protection techniques include material selection,__,__, and_____

答案: Design;
Protective Coating;
Cathodic Protection

16、 Compared with ferrous alloys, nonferrous metals are much lighter, and have lower conductivity.

答案: 错误

17、 The phase diagram contained only two components is known as binary diagrams.

答案: 正确

18、 Annealing and normalizing present a significant difference on the ductility of low carbon steels.

答案: 错误

19、 Tungsten light bulb filaments should be fabricated by P/M process.

答案: 正确

20、 In corrosion process, the total rate of oxidation must equal the total rate of reduction.

答案: 正确

21、 Which of the following do not belong to non-ferrous metal

答案: Stainless steel

22、 Cast iron can be classified into four categories: gray cast iron, white cast iron, nodular cast iron and ______ cast iron.

答案: Malleable

23、 Most cast irons have a chemical composition of ______ percent carbon.

答案: 2.5–4.0

Module 5 Ceramic materials Module 5 Quiz

1、 A major objective in designing new ceramics is to overcome

答案: Brittleness

2、 The term describing the density of ceramics that includes its porosity and both crystalline and noncrystalline phase is_______.

答案: Bulk density

3、 In cold step, the ceramic part is formed or shaped into a preform, which called .

答案: Green part

4、 The main driving force in sintering process is .

答案: The reduction in surface area

5、 When some liquid is formed during processing, we call it_______.

答案: Liquid phase sintering

6、 Some flaws can occur at any of sintering stages, which consist of .

答案: Physical flaws and chemical flaws

7、 ___ is considered as the glass former.

答案: SiO2

8、 ____ is now required on doors in buildings and homes.

答案: Tempered glass

9、 Slower cooling permits some crystallization in the process, we call it__.

答案: Devitrification

10、 Bonding in ceramic materials is____.

答案: Ionic;
Covalent

11、 The basic unit of the silicate structure is the SiO4 tetrahedron, which is formed by:

答案: Silicon;
Oxygen

12、 There are two factors influencing the density of material.

答案: Atomic weight;
How the atoms/ions are stacked

13、 The pores affect the strength of ceramics in the following ways including ______.

答案: Produce stress concentrations;
Reduce the cross-sectional areas

14、 Ceramic process can be simply described as consisting of two steps: and .

答案: Cold step;
Hot step

15、 3D printing enables us to produce complex (functional) shapes using two steps with__and ____ than traditional manufacturing methods.

答案: Less material;
Less step

16、 Because of their bonding and their different atoms and unit cell structure, ceramics offer high resistance to shear and are good insulators.

答案: 正确

17、 Glass can also be sorted to advanced ceramics in certain conditions.

答案: 正确

18、 Setting and hardening are caused by the chemical reactions between the cement and water.

答案: 正确

19、 UV laser in printed material will cause , and then print ceramic components one by one

答案: Internal crosslinking curing

下方是付费阅读内容：本平台商品均为虚拟商品，无法用作二次销售，不支持退换货，请在购买前确认您需要购买的资料准确无误后再购买，望知悉！

完整答案需点击上方按钮支付5元购买,所有答案均为章节测试答案，购买后上方矩形框将出现已付费的隐藏内容。

不知道怎么购买？点此查看购买教程！