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| 1 | FABRICATION AND PROPERTIES OF Al_2O_3 /Ni COMPOSITES显示文摘Ceramic matrix composites consisting of an alumina matrix containing 20 vol% nickel particles has been fabricated using hot pressing technique. It is found that fracture toughness of the composite is much higher than the alumina matrix. This is due to the energy dissipation of the nickel particles that bridge the propagating cracks. | L.X.Ding 1) ,F.Zhang 2) ,Z.J.Zhao 3) ,Y.M.Wang 1) and X.D.Sun 2) 1) Department of Materials, School of Mechanical Engineering, Shenyang University, Shenyang 110044, China 2) School of Materials and Metallurgy, Northeastern Univers | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 1 |
| 2 | DIMENSIONAL INSTABILITY OF LD31 Al ALLOY WELDMENTS AT ROOM TEMPERATURE AND AFTER THERMAL CYCLES显示文摘The unstable dimensional distortion of LD31 aluminum alloy weldments at room temperature and after thermal cycles was studied by use of light interference and CMM(three-coordinate measuring machines). At the same time, distortion mechanism was analyzed from the viewpoint of mechanics and microstructure. Experimental results show that there exists obvious difference of unstable dimensional distortion between LD31 welded specimens under two conditions mentioned above. Under room temperature, dimensional variation of welded specimens will decrease gradually and finally tends to be stable during 200h after welding. The relative elongation of welded specimen is 3.0×10-5; After thermal cycles, distortion of welded specimen is much larger than that at room temperature. After 11 thermal cycles, the dimension will tend to be stable. Dimensional unstable distortion of weldments mainly results from temperature condition, microstructure variation and relaxation of welding residual stress. | X.S.Liu H.Y.Fang W.L.Xu X.T.Tian X.D.Sun | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，1： | 0 |
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