论文网找的，比较短哈，不过不会和别人的重复，因为是我自己发现的论文网（加分的话，我把自己收留的所有论文网发给你邮箱，呵呵，卑鄙吧...）
有漏洞你修改一下哈～a piece of workcontents:(1) Discontinuous coarsening mechanism.It was previously found that spinodal decomposition firstly occurred in the solution-treated Al-Zn-(Cu) alloys held at 2500C for different time, which was slightly below the eutectoid temperature; thenthe spinodal microstructure transformed into the fine lamellar one by DP DP completely ended in 30 min in AlZn alloy, while in 20 min in AlZn-2Cu alloy [5].However, the fine larneflar microstructure was still unstable. When the sample of AlZn alloy was held at 250℃ for 2 h, discontinuous coarsening (DC) cells formed at the primitive boundaries and cellular boundaries of DP (figure 1(a)). With the increase of aging time, discontinuous coarsening cells swal-lowed up the fine lamellar microstructure by the mi- gration of cellular boundaries with high angle, and then the sample became the coarsening cellular dual phase microstructure. At the same time, new discontinuous coarsening cells continually formed at the high angle grain boundaries (figure 1(b)). With the further increase of aging time, the fine lamellar microstructure was replaced by the coarsening lamellar one (figure 1(c)). When the sample of AlZn-2Cu was kept at 250℃, the fine lamellar microstructure of DP similarly changed into the coarsening lamellar one through discontinuous coarsening, but the transformation velocity was slower than that in the AIZn alloy (figure 1(d)). The microstructure evolution of the sample aged at 200℃ was the same as that of the sample aged at 250℃ in the AlZn-(Cu) alloy, i.e. by the discontinuous coarsening mecha- nism of nucleation and growth.(2) Dissolution and spheroidization mechanism.In the AI-Zn-(Cu) alloy aged at 150℃ for 5 h after solution treatment, DP transformation had al- ready finished, and the fine lamellar microstructure of DP was dissolved into the short rod-shaped one,whose size was relatively large at the original boundaries and cellular boundaries (figure 2(a)).The rod-shaped microstructure with large size around and at the boundaries increased and gradu- ally changed into the spherical one with the increase of aging time (figure 2(b)). With the further extension of aging time,the rod-shaped microstructure inside the DP cell also gradually changed into the spherical one, so that fine Zn particles dispersedly distributed at the Al matrix (figure 2(c)). When the sample of AIZn-2Cu alloy was kept at 150℃, the microstructure evolution was similar to that in the AlZn binary alloy, but the third phase was observed in the ternary alloy (figure 2(d)), which was the metastable CuZn4 phase testified by X-ray diffrac-tion analysis. With the increase of aging time, the CuZn4 phase gradually transformed into the A14Cu3Zn phase and finally completely transformed into the A14Cu3Zn phase.中文：（ 1 ）间断粗化mechanism.it以前发现调幅分解首先发生在溶液处理铝锌（铜）合金举行2500c不同时间，其中稍低于共析温度; thenthe调幅微观结构转化为优良层状一个由民主党，民主党，彻底结束了30分钟，在alzn合金，而在20分钟，在alzn - 2cu合金[ 5 ] 。然而，罚款larneflar微观结构仍然不稳定。当样本alzn合金举行250 ℃ 2小时，不连续粗化（直流）细胞形成于原始的边界和蜂窝国界民主党的（图1 （ a ） ） 。随着老化时间的，不连续粗化细胞swal -降低了罚款层组织，由秘光栅的蜂窝边界同高角度，然后样品成了粗化蜂窝双相微观结构。在同一时间，新的不连续粗化细胞的不断形成，在高角度晶界（图1 （ b ）款） 。与进一步增加时效时间，细片层组织取代，由粗化层之一（图1 （ c ）项） 。当样本alzn - 2cu维持在250 ℃时，细片层组织的民主党同样变成了粗化层之一，通过连续粗化，但转化速度慢，在aizn合金（图1 （ d ）项） 。该组织演变的样本年龄在200 ℃是一样的，因为该样本年龄在250 ℃时，在alzn - （铜）合金，即由不连续粗化机制的nism的成核和生长。 （ 2 ）溶解和球mechanism.in了爱锌（铜）合金岁，在150 ℃ ，为5 h固溶处理后，民主党已转化基地准备完毕，并罚款层组织民主党被解散，进入短杆状之一，其规模相对较大，在原选区分界及蜂窝边界（图2 （ a ）条） 。该杆状微结构与大尺寸左右，并在边界的增加，并逐渐- 盟友变成了一个球形随着老化时间（图2 （ b ）款） 。随着进一步延长时效时间，杆状微结构内民主党细胞的同时，逐步转变为球状，使优良锌颗粒弥散分布在铝基复合（图2 （ c ）项） 。当抽样aizn - 2cu合金保持在150 ℃ ， 微观结构演变相类似，在alzn二元合金，但第三阶段是观察在三元合金（图2 （ d ）项） ，这是亚cuzn4相印证x射线diffrac简要分析。随着老化时间， cuzn4阶段逐步转化a14cu3zn阶段，并最终完全转化进入a14cu3zn阶段。 |
