工程材料学(双语).pptVIP

BilingualLanguageTeaching;提要;教学目的;教学内容及重点;教学方法;使用教材;工程材料概述;工程材料;金属材料;工程材料的失效原因及类型;工程材料的选用原那么;Nonferrousalloys:Aluminum,Magnesium,Copper,Nickel,Titanium,Zincandothers;Vocabulary;7.1Overview;box:框;存放器;框符

degasify:vt.脱[去,除]气

modify:vt.变更,修改，缓和,减轻;调节;限制，变质[孕育,改善]处理

component:n.元［部,组］件,成［部］分

designation:n.指出,指明;任命,选派;称呼;名称;【军】番号;标号[记,志];目的,目标;non-ferrousmetal:有色[非铁]金属

wrought:adj.[古]work的过去式及过去分词

制造的;形成的;精炼的,锻成的

n.锻件、轧材和冷拨产品的总称,精制

wroughtiron:n.熟铁,锻铁

cast:铸件n；浇铸v

castiron:铸铁

componentdesign:零件设计

;Category;Property;7.2AluminumAlloys;ρ=2.7g/cm3——lightweightalloy

T=660℃；

Atomicstructure

3valenceelectronsintheoutermostelectronicshell——goodelectricalandthermalconductivity

Unitcell

FCC——excellentductilityandformability,

Excellentcorrosionresistance

;Principalalloyingelements;Si

﹡second-phasestrengthening

﹡Al-Sicastalloys(wSi=10-13%)

﹡Si+Mg→Mg2Siprecipitate(wSi=1.0-1.2%)

Zn

﹡highsolubility——?solidsolutionstrengthening

﹡wZn=0.4-0.8%——?strength,?corrosionresistance

﹡precipitate-formingelementinmulti-componentalloys——precipitationstrengthening

Li

﹡?density，?elasticmodulus

﹡Al3Liorderingprecipitatephase——precipitationstrengthening;wLi≤3.0%inAl-Lialloys;CastAlalloys

WroughtAlalloys

﹡heattreatableAlalloys

﹡non-heat-treatableAlalloys;Abroad

1XXXAl

2XXXAl-Cu

3XXXAl-Mn

4XXXAl-Si

5XXXAl-Mg

6XXXAl-Mg-Si

7XXXAl-Zn;Annealing

﹡Recrystallizationannealing〔fullannealing〕

relieveworkhardenging——?ductility

﹡Lowtemperatureannealing

relieveinternalstress——modestly?ductility——generally180~300℃

﹡Homogenizationannealing(diffusionannealing)

relievecompositionsegregationandinternalstress

Solidsolutionheattreatment;Agingtreatment

﹡naturalaging;artificialaging;eg.Al-Cualloy

﹡Optimalagingtemperature

Ts=(0.5-0.6)Tm

Tm:meltingtemperatureofthealloy

Retrogressionand