共搜索到17626条信息,每页显示10条信息,共1763页。用时:0小时0分0秒367毫秒
. However, an interesting microstructural change in the as-cast Mg-3Sn-2Ca alloy added with 0.5%Ce is observed. After adding 0.5%Ce to Mg-3Sn-2Ca alloy, not only the volume fraction of CaMgSn phase...%Ce to Mg-3Sn-2Ca alloy, the second creep rate of the alloy at 150 ℃ and 70 MPa for 100 h changes from 3.28×10-8 to 1.81×10-8 s-1. Key words: magnesium alloy; Mg-3Sn-2Ca alloy; CaMgSn phase; Ce......
lower than those of the Mg-3Sn-2Ca alloy. Key words: magnesium alloy; CaMgSn phase; Sn; Ca; mechanical properties  ... a stable Mg2Sn compound with Mg, and Ca can improve creep resistance by forming stable Mg2Ca intermetallic particles with Mg[4-5]. In addition, Sn, Ca and Mg can form the CaMgSn phase which has higher......
凝固冷速与时效时间对CaMgSn形态的影响邱克强,李荣华,王俊杰,杨君宝沈阳工业大学材料科学与工程学院摘 要:针对CaMgSn形貌对Mg-Sn-Ca系合金的力学性能具有重要的影响,研究了慢冷,快冷及时效处理对CaMgSn组织形貌的影响规律.分别采用光学显微镜,扫描电镜,X射线衍射仪和维氏硬度计对比分析了不同处理条件对Mg-3Sn-2Ca-3Cu(质量分数/%)合金微观组织,相结构和硬度的影响.Mg-3Sn-2Ca-3Cu合金慢冷组织主要由α-Mg,CaMgSn,Mg2Ca,CuMg2和Mg2Sn构成,其中CaMgSn为粗大的棒状相;快冷及时效处理后,CaMgSn的形态发生了明显的改变,在时效48 h时,转变为近球状形貌.时效处理后,合金的维氏硬度得到了明显的提高,在时效48 h时达到最高值77.随时效......
of α-Mg, Mg2Sn and CaMgSn phases. With the addition of Gd, the formation of the Mg2Sn phase is impeded and the CaMgSn phase is refined, whereas the ultimate tensile strength and elongation decrease... by forming stable CaMgSn phase in the matrix[2-5]. Recently, Mg-3Sn-2Ca alloy has been identified as one of the most promising magnesium alloys, which processes excellent thermal stability[3-7......
热处理对ATX525镁合金中CaMgSn相形貌演化的影响热焱1,邱克强1,2,任英磊1,李荣德1,21. 沈阳工业大学材料科学与工程学院2. 辽宁省轻金属材料重点实验室摘 要:采用XRD,SEM和EDS研究了热处理温度对ATX525镁合金相组成,显微组织和析出相成分的影响,考察了保温时间为24 h条件下,Ca Mg Sn相随温度变化的演化规律.结果表明,合金组织中析出相由热稳定性较高的Mg2(Al,Ca),Al2Ca和Ca Mg Sn等相组成.其中,Ca Mg Sn相中Sn和Ca含量随处理温度变化而变化,从而使其热稳定性和形貌发生变化.当温度低于500℃时,主要发生Ca Mg Sn溶断和破碎过程,体积分数没有显著变化;当温度为550℃时,Ca Mg Sn相发生溶入基体过程,体积分数减少;然而当处理温度......
......
......
Phase Separation Process at Early Aging Stage of Ni42CrTiAl Jiao shao-yang1,XU Bing-she1,HU lan-qing1,WEI Ying-hui1,HOU Li-feng1 (1.Taiyuan University of Technology, Taiyuan, China) 摘要:Phase... decomposition is500℃. And the solid solution break into the lean and the rich areas, moreover the rich solute areas would have ordering arrangement to form ordering phase. 关键词:alloy; spinodal decomposition......
......
PHASE TRANSFORMATION BEHAVIOR IN THE SPUTTERDEPOSITED Ti-Pd-Ni THIN FILMS J.S.Wu1,Q.C.Tian1 (1.Key Laboratory of the Ministry of Education for High Temperature Materials and Tests,School... calorimetry (DSC). It was found that the phase transformation temperatures of Ti50.6Pd30Ni19.4 ingot are much higher than those of its thin film. The B19'' and B19 phases coexisted, together with the Ti2Ni......