纳米晶Al的制备及拉伸性能(Ⅱ)  

SYNTHESIS AND TENSILE PROPERTIES OF NANOCRYSTALLINE Al(Ⅱ)

作　　者：丛洪涛[1] 孙秀魁[1] 徐坚[1] 卢柯[1] 

机构地区：[1]中国科学院金属研究所快速凝固非平衡合金国家重点实验室

出　　处：《材料研究学报》1998年第6期651-654,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金!59431022

摘　　要：将用蒸发法制备的纳米Al粉体冷压成直径25×2mm的块材经620℃／40min热处理后，进行变形量为55％的冷轧形变处理线切割成标距为10mm的拉伸试样.冷轧后样品的相对密度为99％，平均晶粒尺寸约为53nm．拉伸实验结果表明：冷变形致密化的纳米晶Al的屈服强度σ0．2和断裂强度σb分别是同质粗晶Al的12～16倍和5～6倍：延伸率δ比同质冷轧粗晶Al提高大约28％。Nano-Al particfes prepared by plasma evaporation method were compacted at room temperature into disc-shape samples with a dimension of 25×2mm. After annealing at 620℃ for 40min, the samples were cold-rolled to form sheets with thickness of lmm and length of 40mm. The sheets were machined into dogbone-like samples for tensile test. Densities of the sampfes are all 99%of theoretical density. Average grain size determined by XRD and TEM observation is about 53nm.The results of uniaxial tensile test showeds yield strength 0.2 and breaking strength of nano-Al densified by cold deformation are 12-16 and 5-6 times that of annealed coarse-grained Al, respectively.Its elongation b is about 28% greater than that of cold-rolfed coarse-grained Al and 2 times that of undeformed nano-Al.The efFects of cold deformation on the properties of nano-Al were discussed.

关 键 词：纳米晶 冷变形 拉伸性能 铝 制备 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]