【摘 要】
：
The phase selection of ternary intermetallic compound τ phase (Mg32 (Al,Zn)49) and φ phase (A12Mg5Zn2) in high zinc magnesium alloys was studied by using scan
【机 构】
：
School of Materials Science and Engineering,Materials Science Division
论文部分内容阅读
The phase selection of ternary intermetallic compound τ phase (Mg32 (Al,Zn)49) and φ phase (A12Mg5Zn2) in high zinc magnesium alloys was studied by using scanning electron microscope,X-ray diffractometer and differential scanning calorimeter,etc.The results indicate that,when adding element Si in Mg-8Zn-4Al-0.3Mn (ZA84) alloy,φ phase is promoted,whereas τ phase is inhibited.The Chinese script-type Mg2Si and matrix microstructure are greatly refined,the formation of τ phase is facilitated and φ phase is restrained when modifier Al-AlP master alloy is added in ZA84 alloy containing Si.The kinetics study of phase selection indicates that there is a critical degree of undercooling of the melt.If the undcrcooling exceeds the critical value,τ phase preferentially forms while φ phase is restrained; otherwise,φ phase preferentially forms while τ phase is restrained.
其他文献
YAG:Ce3+ phosphor was prepared by sol-gel low-temperature combustion method.The effects of the precursor properties and calcining temperature on the crystalliza
An electrostrictive uniaxial ultrasonic levitation reaction system was designed to perform TiC synthesis reaction by suspending graphite powder in Al-3Ti melt a
A facile and efficient method has been developed for microencapsulation of metal oxide nanoparticles in polyurea via interfacial polymerization of toluene-2, 4-
The simulation field became essential in designing or developing new casting products and in improving manufacturing processes within limited time, because it c
In this work the microstructure, mechanical properties and wear resistance of Fe-Al based alloys with various al- loying elements were studied. The microstructu
美好乡村建设是新型城镇化建设的重要组成部分,其目的是通过生态、生产和生活“三生”同步发展使人们的生活更美好,人与自然关系更和谐.为此必须做好土地规划,节约利用土地、
On the base of the influence rule of silica fume, slag and fly ash on alkali-silica reaction under the condition of 70℃, the mechanism of the effect of mineral
The Gd2O2CO3:Eu3+ with type-II structure phosphor was successfully synthesized via flux method at 400℃ and their photoluminescence properties in vacuum ultravi
Microstructure strongly influences the mechanical properties of cast iron. By inoculating the melt with proper inoculants, foreign substrates are brought into t
Based on the experimental data of apparent viscosity about semi-solid A356 aluminum alloy,the apparent viscosity model was developed and inserted into a commerc