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察了时效温度的影响.图3所示为不同Gd含量Mg-Gd二元合金在225 ℃的等温时效硬化曲线.从图3中也可以明显地看出,w(Gd)＜10%,合金几乎没有时效强化效果；随着Gd含量的增加,时效析出强化效果则大为改善,峰值硬度也不断提高.这一结果是由于Gd元素含量增高后,固溶淬火后合金中Gd元素的过饱和度增加,时效过程中析出相从基体中析出的驱动力增大,脱溶速度加快[12]；同时,析出相数量也增加,对基体...以细化晶粒的原因,但至今还没有关于晶粒大小对Mg-Gd二元合金时效析出的影响的系统研究. 1.1.4 变形量的影响 以往的研究发现,时效前的变形可以促进Al-Cu合金的时效析出[11],这一现象在对WE54合金(Mg-Y-Nd-Zr)的研究中[21]也曾报道.而Mg-Gd系合金的时效析出过程以及析出序列与WE54十分相似[2].等[22]专门研究形变对Mg-Gd二元合金时效析出的影响......
of intermetallic compounds can also be affected by alloying elements, such as Si, Cr, Cu and C. Among these elements, Si has the greatest effect, whenever it contains in the matrix or is added in the Al bath... work by applying the test apparatus as shown in Fig. 5. Our results showed that there were more micro-cracks on the corrosion-wear surface of H13 steel than those on tungsten (W). Meanwhile, micro......
; (4) where W is the volume loss during test period (cm3/m... with percent tool wear. The multiple regression model (W=0.584l-1.038v-0.009ω-6.028 with a R2 value of 0.81) indicated that wear is strongly dependent on process parameters. This relationship......
processes were performed at a speed of 1 mm/s and at the room temperature of 20 °C. Zinc stearate powder was used as a lubricant in all of the deformation processes. The imposed effective plastic... the FEM and the microstructure observations of the ECAP of Cu [17]. Fig. 10 OM micrograph of shear band in longitudinal direction (pressing direction) corresponding Al-1080 deformed by ECAP at top......
; (9) 式中:h和w是压入深度和母线宽度；S是形状系数；ω是一个粗糙的尖端曲率；χ和λ是表征凹凸形状的常数.采用Challen and Oxley摩擦模型计算接触界面上所...-min, ZHOU Xiao-ping, PAN Yong-qing, ZHOU Xi-zhi. Microstructure and properties of cermet coating on surface of H13 steel by vacuum powder sintering[J]. Special Casting & Nonferrous Alloys, 2005, 25......
of Mining Science and Technology, 2017, 27(4): 669-673. [30] WANG A L, MA L Q, WANG Z W, YI X J. Soil and water conservation in mining area based on ground surface subsidence control: development of a high... in pipe elbows[J]. Canadian Journal of Chemical Engineering, 2016, 95(6): 1181-1191. [40] BRACKEBUSCH F W. Basics of paste backfill systems[J]. Mining Engineering, 1994, 46(1): 1175-1178. [41] 江 梅. 磷......
the magneto-hydrodynamic free convection flow and heat transfer characteristics of Cu-water nanofluid inside a square enclosure with porous medium under the influence of viscous dissipation and temperature..., the influence of porous fins and Cu-water nanofluid on free convection flow and heat transfer behaviour with entropy generation in a cavity was studied by SIAVASHI et al [5]. It is noticed from......
velocity; w is the tangential velocity; A is the pipe cross section area, turbulence (pulsation) can be ignored, so the velocity is considered to be the time averaged velocity. LIU et al [40] defined......
Trans. Nonferrous Met. Soc. China 30(2020) 518-534 Extraction and stripping of Cu and Ni from synthetic and industrial solutions of Sarcheshmeh Copper Mine containing Cu, Ni, Fe and Zn ions..., Islamic Azad University, South Tehran Branch, Tehran, Iran Received 16 April 2019; accepted 12 November 2019 Abstract: The extraction and stripping of Cu and Ni ions from synthetic and industrial......
. The dewatered sludge is collected, and it is first dried naturally in the room for several weeks, then crushed and screened through a 2 mm sieve. Finally, the sludge powder is dried in an oven at 105... by Eq. (1). w(O)=100%-wAsh-w(H)-w(C)-w(N)-w(S) (1) where w(Ash) is the content of ash in SS and biochar (wt.%); w(C), w(H), w(S), w(N) and w(O) are the mass percentages of carbon......
