大连理工大学主页平台管理系统付雪松 2Al2铝合金时效成形的微观组织和力学性能中文主页

论文成果

Fabrication and Superplastic Deformation of Al(2)O(3)/YSZ/MgAl(2)O(4) Composite Ceramic: 点击次数：; 发布时间： 2019-03-11; 发布时间：2019-03-11; 论文类型：会议论文; 发表时间：2009-08-16; 收录刊物：Scopus、CPCI-S、EI; 卷号：105-106; 期号：1; 页面范围：188-191; 关键字：Al(2)O(3)/YSZ/MgAl(2)O(4) composite; microstructure; superplastic forming; 摘要：High strain rate superplastic forming is the key issue of the industrial application of superplastic ceramic and is also an effective approach to achieve "near-net shaping" of ceramic parts with complicated shape. The sol-gel method was adapted to synthesize the nano-sized composite powders. A three-phase nanocomposite ceramic Al(2)O(3)-30mol%YSZ-30mol%MgAl(2)O(4) (AZ30S30) was prepared by using hot-pressing sintering in vacuum. Then the superplastic forming of a ceramic part with relatively complicated shape was accomplished and some new characters in superplastic forming were studied. The results demonstrate that as-sintered ceramic is a typical inter/intra granular nano-structured composite. Because the dispersed second phase inhibited the growth of the alumina matrix grains in deformation as well as in sintering, the material behaves excellent superplastic formability. The extrusion forming at a high strain rate was achieved and the part in cup shape was obtained. The yttrium element segregated obviously at the grain boundary after deformation, which demonstrated that the yttrium element directionally diffused during the deformation. The mechanical properties of the ceramic did not change much after extrusion. The maximum hardness of as-deformed composite ceramic is 32GPa, a litter lower than that of 35GPa before deformation.

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付雪松

同专业博导同专业硕导个人学术主页

副教授博士生导师硕士生导师

性别：男

毕业院校：大连理工大学

学位：博士

所在单位：材料科学与工程学院

学科：材料加工工程

办公地点：大连理工大学铸造中工程心

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