北京化工大学：《材料导论》课程教学资源（课件讲稿）Module4 Metallic Materials

Intduction to Materials Modte4 Metallic Materials PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn

Introduction to Materials Module 4 Metallic Materials PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

History of Metals .Copper,gold and silver are believed to be the first metals known to man because they exist in nature in the metallic state. Copper pieces dating back to 4000-3000 B.C.have been discovered. Early metal objects were made by hammering or beating the naturally occurring metal to the desired shape PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn

History of Metals •Copper, gold and silver are believed to be the first metals known to man because they exist in nature in the metallic state. •Copper pieces dating back to 4000-3000 B.C. have been discovered. • Early metal objects were made by hammering or beating the naturally occurring metal to the desired shape PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

Death Mask of Tutankhamen PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn

Death Mask of Tutankhamen PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

Copper .Copper melts at 1083C and a wood fire has a maximum temperature of 600C. .A charcoal fire is needed to melt copper. -Copper absorbs a lot of gas and therefore when cast it forms a lots of holes or porosity. .Pure copper is also very soft. PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn

Copper •Copper melts at 1083oC and a wood fire has a maximum temperature of 600oC. •A charcoal fire is needed to melt copper. •Copper absorbs a lot of gas and therefore when cast it forms a lots of holes or porosity. •Pure copper is also very soft. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

Bronze Age .Bronze is a copper-tin alloy .The Bronze Age dates from 3600-1400 B.C. .The Egyptians made bronze objects by a technique called investment casting. .Bronze is much harder and stronger than pure copper. .Bronze does not form much porosity when cast. PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn

Bronze Age •Bronze is a copper-tin alloy. •The Bronze Age dates from 3600-1400 B.C. •The Egyptians made bronze objects by a technique called investment casting. •Bronze is much harder and stronger than pure copper. •Bronze does not form much porosity when cast. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

Imperial Palace Bronze Bronze casting from Chinese Imperial Palace collection.Dates back to1100-1000B.c PDF文件使用"pdfFactory Pro”试用版本创建wmm,fineprint.com,cn

Imperial Palace Bronze Bronze casting from Chinese Imperial Palace collection. Dates back to 1100-1000 B.C. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

Iron Age .From 1400 to 1200 B.C.iron became more important. .1200 B.C.is the start of the Iron Age .Iron was stronger that bronze. .Iron tools could maintain a sharp edge and therefore was superior in making weapons. PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn

Iron Age •From 1400 to 1200 B.C. iron became more important. •1200 B.C. is the start of the Iron Age. •Iron was stronger that bronze. •Iron tools could maintain a sharp edge and therefore was superior in making weapons. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

Engineered Materials .The discussion of metals starts our discussion of engineered materials. .These are materials that are man-made and designed or engineered for specific applications. PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn

Engineered Materials •The discussion of metals starts our discussion of engineered materials. •These are materials that are man-made and designed or engineered for specific applications. PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn

4.1 Ferrous Metal PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint.com.cn

4.1 Ferrous Metal PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn

The earth crust implies the importance of ferrous metal High strength,machinability, alloying element Function provided by nonferrous metal: Corrosion resistance:Titanium,Brass Low density:Aluminum,Magnesium Strength at elevated temperature:Nickel PDF文件使用"pdfFactory Pro”试用版本创建ww.fineprint.com.cn

The earth crust implies the importance of ferrous metal High strength，machinability， alloying element Function provided by nonferrous metal: Corrosion resistance：Titanium, Brass Low density: Aluminum , Magnesium Strength at elevated temperature: Nickel PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn