稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2012年
5期
757-761
,共5页
铝合金%热压缩%微观组织%加工图
鋁閤金%熱壓縮%微觀組織%加工圖
려합금%열압축%미관조직%가공도
aluminum alloy%hot compression%microstructure%processing map
采用能量消耗加工图研究2E12铝合金热压缩过程中的变形行为及其微观组织演变,且建立能量消耗效率与微观组织演变的关系.压缩变形温度范围为250～500℃,应变速率范围为0.01～10 s-1,总真应变量为0.5.结果表明,加工图中存在2个动态回复区域:(I)325～400℃,0.01～0.03 s-1,(2) 350～450 ℃,1.78～10 s-1.当温度高于450℃时,2E12合金发生部分动态再结晶现象,且动态再结晶体积分数随变形温度的升高而增大,但是当温度为500 ℃,应变速率为1～10s-1时,2E12合金发生了第二相粒子回溶和沿晶开裂的现象.
採用能量消耗加工圖研究2E12鋁閤金熱壓縮過程中的變形行為及其微觀組織縯變,且建立能量消耗效率與微觀組織縯變的關繫.壓縮變形溫度範圍為250～500℃,應變速率範圍為0.01～10 s-1,總真應變量為0.5.結果錶明,加工圖中存在2箇動態迴複區域:(I)325～400℃,0.01～0.03 s-1,(2) 350～450 ℃,1.78～10 s-1.噹溫度高于450℃時,2E12閤金髮生部分動態再結晶現象,且動態再結晶體積分數隨變形溫度的升高而增大,但是噹溫度為500 ℃,應變速率為1～10s-1時,2E12閤金髮生瞭第二相粒子迴溶和沿晶開裂的現象.
채용능량소모가공도연구2E12려합금열압축과정중적변형행위급기미관조직연변,차건립능량소모효솔여미관조직연변적관계.압축변형온도범위위250～500℃,응변속솔범위위0.01～10 s-1,총진응변량위0.5.결과표명,가공도중존재2개동태회복구역:(I)325～400℃,0.01～0.03 s-1,(2) 350～450 ℃,1.78～10 s-1.당온도고우450℃시,2E12합금발생부분동태재결정현상,차동태재결정체적분수수변형온도적승고이증대,단시당온도위500 ℃,응변속솔위1～10s-1시,2E12합금발생료제이상입자회용화연정개렬적현상.
The deformation behavior and microstructure evolution in a hot compressed 2E12 alloy was investigated by constructing power dissipation map in which work efficiency can be related with microstructure evolution.Compression tests were performed in the temperature range of 250-500 ℃ and the strain rate ranging from 0.01 s-1 to 10 s-1 up to a true strain of 0.5.The processing maps reveal that two domains where dynamic recovery occurs comparatively:(1) 325-400 ℃ and 0.01-0.03 s-1,(2) 350-450 ℃ and 1.78-10 s-1,and partial dynamic recrystallization occurs at T≥450 ℃.However,there also is evidence of redissolution of the particles and intercrystalline cracks at 500 ℃ and 1-10 s-1.It is shown that the volume of partial recrystallization increase with increasing of deformation temperature.
