最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

Abstract:This paper presents a series of Al-Li alloys and their productive capacity all over the world. The application and improvement of Al-Li alloys are also described in the paper.

Abstract:brief introduction is presented for the recent advances in methods of preparing metal fibers including bundle-drowing. chatter- machining and melt-spinning. The status of study and applicataion of metal fibers is also described in this paper.

Abstract:inetics of isothermal transformation of supersaturated phase of ordered a2 was investagated with method of quantitative metallographic examination and X- ray diffraction. The relationship between the amount of 7 phase precipitation and the isothermal transformation time with the both method is agreed. The rate of isothermal transformation in alloy 45Al is larger remarkably than the one in alloy 42Al. Under the eutectoid temperature in Ti- Al phase diagram the rate of transformation decreases with temperature,ho it is.not able that the isothermal transformation curve becomes the shape of letter C.

Abstract:探討了粉末應(yīng)力松弛的基本規(guī)律，提出了粉末應(yīng)力松弛的流變機(jī)理，采用非線性流變模型定量描述了粉末應(yīng)力松弛的應(yīng)力和應(yīng)變關(guān)系，計(jì)算結(jié)果表明，理論計(jì)算值和實(shí)驗(yàn)值吻合良好。

Abstract:he lattice parameter c values of highly textured YBCO thick films were calculated by using an X-ray diffraction dual-line method. The lattice parameter values of samples prepared on Ni substrate rather smaller than those of sintered samples and thick films prepared on Ag-Pd substrate. Increasing substrate temperature during spray, sintering temperature after spray, and moving speed of smsples during zone melting makes lattice Parameter c decrease. Generally, the samples which have higher To have rather smaller lattice parameter c values.

Abstract:ffect of Zr addition on the property stability of CuZnAl alloy was investigated. It showed. Zr- doped could reduce martensite stabilization trend and improve property stability in the mid-temperature. X-ray diffraction results showed that Zr restrained the variation of order parameter and the formation of equilibrium phase when the alloy aged in the mid-temperature.This might have relation with the change of excess vacancy concentration which resulted from grain refining.

Abstract:研究了室溫和４００℃去應(yīng)力退火狀態(tài)Ｚｒ－４合金對(duì)稱拉－壓低周疲勞行為。建立了循環(huán)和單調(diào)加載方式下Ｚｒ－４合金應(yīng)力－應(yīng)變曲線方程和循環(huán)應(yīng)變幅－疲勞壽命之間的關(guān)系；分析了溫度對(duì)Ｚｒ－４合金變形行為和疲勞性能的影響；討論了高溫疲勞壽命預(yù)測(cè)方法；根據(jù)疲勞斷口ＳＥＭ觀察結(jié)果，分析了Ｚｒ－４合金在室溫和４００℃疲勞斷裂方式的異同。結(jié)果表明，Ｚｒ—４合金室溫下的循環(huán)應(yīng)力－應(yīng)變曲線表現(xiàn)為循環(huán)硬化，而４００℃下表現(xiàn)為循環(huán)軟化；室溫和４００℃下的循環(huán)應(yīng)變幅－疲勞壽命關(guān)系分別為△εｐ·Ｎｆ０．７６６８＝４８．９４，△εｐ·Ｎｆ

Abstract:he investigating results of preparing high Performance Si3N4 powder by carbon reduction and nitridation from SiO2 is reported in this paper.lt has been studied that the effeCt of the technological factors such as the nitriding temperature,the nitriding time and nitrogen flow,etC.on the colour,particle shape,Pareicle size, particle distribution and phase structure of the nitriding products. The forming conditions of the amorphism,SiO2 and SiC products are discussed.Results show that the nitriding technological factors influence obviously the performances of the nitriding products.High quality St3N. POwder with high a phase ratio,fine particle and homogeneous particle distribution can be prepared by the technological conditions of using the nitriding temperature 1450t,the nitriding time 2h and the nitrogen flow 2.5L/ min.

Abstract:研究了工藝參數(shù)對(duì)制備ＰｂＯ２／Ｔｉ電極性能的影響，通過(guò)ＳＥＭ、ＸＲＤ和強(qiáng)化壽命結(jié)果分析，得出了制備Ｐｂｏ２／Ｔｉ電極的最佳工藝條件即鍍?chǔ)拢校猓希驳淖罴央娏髅芏龋常粒洌恚?，鍍液溫度６０℃。試?yàn)結(jié)果表明，在Ｈ２ＳＯ４、ＨＮＯ３介質(zhì)中，對(duì)析氧反應(yīng)而言，Ｔｉ／ＰｂＯ２電極具有好的催化活性和高的陽(yáng)極電位；在１５０ｇ／ＬＨ２ＳＯ４、６０℃、２００Ａ／ｄｍ２條件下，強(qiáng)化壽命最高達(dá)１３０９ｈ。

Abstract:敘述了在鉬粉的工業(yè)化生產(chǎn)條件下采用原料添加法來(lái)提高最終粉末粒度，改善原料工藝性能的試驗(yàn)。研究表明：在鉬酸銨原料中添加一定組份的鑰粉，能有效地改善鉬酸銨在動(dòng)態(tài)焙解還原時(shí)的分散性和流動(dòng)性，選擇不同的添加量和添加粉粒度，可有效地把鉬粉的ＦＳＳＳ粒度從２．５μｍ提高到４．２μｍ，從而可根據(jù)用粉要求，選擇合適的添加工藝，來(lái)制取理想的鉬粉。

Abstract:The effects of different aid-gases and technological parameters on laser cutting of titanium alloy have been investigated. The characters of cut plane and heat affected zone of laser cutting have been analyzed. The experimental results show that the best cutting quality can be obtained when argon is used as an aid-gas. The laser power and cutting speed have of feets on the cutting width and heat affected zone. The cut plane can be divided into two zones which have different appearance. There is a distinguishing boundary between the two zones. The width of heat affected zone on upper surface is narrower than that on lower surface.

Abstract:wo methods of measuring differential pressure of hydrogen- the gas flow method and the gas weight method are presented and compared each other during the hydrogen-charging to Ti-alloy.lt is shown that the results obtained by two methods are basically indentical.

Abstract:his article Presents the historical development of the implant metallic malerials in human body. The characters of the stainless steel, cobaltchormium alloys,titanium alloys and new type of biological engineering metallic materials-shape memory alloys are described. The domestic-oversea general situation and the PractiCeS of their application are also presented in this paper.

Abstract:he lst International Symposium on Structural Intermetallics is introduced in this poper.The important achievements in the field of Intermetallics in the world and their prospects in application developments are also reviewed.