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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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大应变量冷轧AA1050铝合金微观组织与织构的演变
, PP. 647-651
Keywords: 铝合金,冷轧,电子背散射衍射,微观组织,织构
Abstract:
采用ECC和EBSD技术研究了AA1050铝合金冷轧到大应变量下微观组织和织构的演变规律.结果表明,AA1050合金冷轧到大形变量时,微观组织由低应变下的胞块组织结构转变成典型的层片状界面(LBs)结构,其内部的LBs基本与轧向(RD)平行;主要存在两种转变机制,即由于轧制变形(机制I)和借助于S--bands结构的剪切作用(机制II),从而导致GNBs逐渐旋转到与RD平行,且以机制I为主.变形过程中,由于晶粒的分裂形成大量的大角度界面,随应变的增加,大角度界面的间距逐渐减小、数目逐渐增多;当冷轧到90%应变量时,除原始晶界外,约为47%的大角度界面起源于变形诱导的界面.冷轧变形主要形成典型的Brass+S+Copper轧制织构,且强度随应变的增加而逐渐增加.
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