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. HORSTEMEYER et al[5] have investigated the internal state variable rate equations in continuum framework to model void nucleation and growth in a casting Al-Si-Mg magnesium alloy. In this work... state dependent damage evolution in a cast Al-Si-Mg aluminum alloy[J]. Theo Appl Frac Mech, 2000, 33: 31-47. [6] TVERGAARD V, NIORDSON C. Nonlocal plasticity effects on interaction of different size......
用Levenberg-Marquardt算法计算相图 何志1,介万奇1,张瑞杰2 (1.西北工业大学,凝固技术国家重点实验室,西安,710072;2.清华大学,机械系,北京,100084) 摘要:应用Levenberg-Marquardt(L-M)算法进行相图的计算.L-M算法能够实现计算精度和收敛速度的最佳结合,并对初始值的选取不敏感.用L-M算法计算所得的三元Al-Si-Mg合金相图与实验相图吻合得很好. 关键词:冶金物理化学; 相图计算; Levenberg-Marquardt算法; Al-Si-Mg合金; [全文内容正在添加中] ......
Alloy 20不锈钢薄板等离子弧焊接工艺研究赵斌,王宾宾,王小华中国船舶重工集团公司第七二五研究所摘 要:对Alloy 20不锈钢薄板进行了等离子弧焊接工艺试验研究.结果表明,采用等离子弧焊接方法,ERCr Ni Mo-3焊材及合理的焊接工艺参数,等离子弧焊接工艺可用于Alloy 20不锈钢薄板的焊接,焊接接头各项性能均能满足要求.关键词:Alloy 20;不锈钢薄板;等离子弧焊接;......
to model void nucleation, growth, and coalescence in a cast Al-Si-Mg alloy. In this work, the mechanical behavior of a casting magnesium alloy containing numerous microvoids was investigated through..., 2003, 26: 28-35. [14] HORSTEMEYER M F, LATHROP J, GOKHALE A M, DIGHE M. Modeling stress state dependent damage evolution in a cast Al-Si-Mg aluminum alloy [J]. Theoretical and Applied Fracture......
)Abstract:Stainless die with micro-groove and micro-hole have been designed and manufactured, which has been used to study superplastic microforming of 2091Al-Li alloy by means of superplastic forming... micro-rib specimen, behavior of material could be understood well.Key words:superplasticity; microforming; extrusion; 2091Al-Li alloy......
. Secondary solidification behaviour of the Al-Si-Mg alloy prepared by the rheo-diecasting process [J]. Acta Materialia, 2006, 55: 1589-1598. [15] JI S, ROBERT K, FAN Z. Isothermal coarsening of fine... at the early solidification stages. 2 Experimental The raw material used in this work was a secondary die casting aluminum alloy AlSi9Cu3 (balance Al, 9.4% Si, 3.4%Cu, 0.72%Fe, 0.72%Zn, 0.27%Mn, 0.34......
Y2O3和Al-Si-Mg系矿化剂复合改性陶瓷型壳的高温抗变形性研究郭振,赵玉涛,马德新,贾志宏,梁向锋,徐维台江苏大学材料科学与工程学院摘 要:为了改善单晶叶片用陶瓷型壳的高温抗变形性能,利用Y2O3和Al-Si-Mg系矿化剂复合制备添加量为2%(质量分数,下同),4%和6%的型壳试样,对试样的热膨胀性和高温自重变形性进行研究.结果表明:随着添加量的增加,型壳的高温热膨胀性和高温自重变形率先减小后增大,当添加量为4%时,改善效果最佳,线膨胀率和自重变形率在1500℃的最小值为0.66%和0.55%,且复合矿化剂对高温自重变形的平均降低效率是热膨胀性的2倍.复合矿化剂改性型壳的机理主要以桥连状莫来石为微结构骨架及填充晶体间的细小球状钇铝石榴石(YAG)来阻碍玻璃相的黏性流动,共同提高型壳抗变形性.但添......
. BAE and GHOSH [11,12] experimentally investigated cavity growth in a superplastic flow of Al-Mg alloy and suggested an improved plasticity-based model. PATANKAR and JEN [13] investigated the effect... alloy. NIEH et al [14] reported that the addition of scandium (Sc) to Al-Mg alloy resulted in the precipitation of fine Al3Sc, effectively pinning grain boundaries during recrystallization. As a result......
in continuum framework to model void nucleation, growth and coalescence in a casting Al-Si-Mg aluminum alloy. The work presented here is to extend the foregoing research results in porous ductile media...]. Computational Materials Science, 2003, 26: 28-35. [11] HORSTEMEYER M F, LATHROP J, GOKHALE A M, DIGHE M. Modeling stress state dependent damage evolution in a cast Al-Si-Mg magnesium alloy [J]. Theoretical......
alloy; microstructure; heat treatment; dimensional stability 1 Introduction ZL114A alloy is high strength Al-Si-Mg casting aluminum alloy, which is produced by adding a certain amount of Mg into Zl101A... and 280 °C, respectively. Fig.3 gives the TEM microstructures of ZL114A alloy after aging treatment. Generally, precipitation of Al-Si-Mg alloy occurs by following steps: supersaturated α→GP zone→β......