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アルミニウム固溶体の超塑性と粒界すべりの役割

铝固溶体中超塑性和晶界滑移的作用

基本信息

批准号：
09228224
负责人：
大塚正久
金额：
$ 1.28万
依托单位：
Shibaura Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1997
资助国家：
日本
起止时间：
1997 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09228224/
关键词：
はんだ無鉛はんだ Sn-Pb 共晶合金ぬれ性機械的性質疲労環境汚染

项目摘要

超塑性発現の一つの目安としてしばしば歪速度感受性指数m≧0.3が挙げられる.微細結晶粒材料では粒界すべり(m=0.5)が主要な高温変形機構となるため,この条件が満たされ,超塑性が発現することは周知の通りである.他方,高温変形がsolute dragにより支配されるいわゆるClassl型(クリープの応力指数n=3)の合金に関するAl-Mg固溶体やAl-Cu固溶体では,結晶粒径-歪速度で表した変形機構図に見るように,結晶粒が微細でなくても(極端な場合単結晶でも)m=1/n=0.33>0.3となるので,実際の金属成形で期待される300%以上の伸びが得られるのではないか.このような観点から,本研究では比較的高濃度の溶質原子を含み,かつ粒界すべりの寄与を無視し得るほどの粗大な結晶粒からなるAl-Cu合金について,超塑性発現の可能性を検討した.その結果,ClassI型挙動が現れる変形条件下で400%を超える超塑性伸びを示すことが判明したので,以下にその特徴と変形機構について考察した結果を報告する.供試材は99.99%Alおよび99.9%Cu地金より溶製されたAl-4.5mass%Cu合金で,化学組成はCu4.54,Si0.016,Fe0.010,Mg0.004,Zn0.004,残部Alである(単位mass%).引張試験片の製造工程は,地金溶解→水平加熱鋳型式連続鋳造(いわゆるOCC法)→均質化処理(833,7.2ks)→切削加工(ゲージ部長さ10mm,太さ4m,R部付き)→ゲージ部の歪取り電解研磨である.これらをインストロン型試験機による定速引張試験に供した.温度範囲は673〜821K(0.73〜0.90Tm),歪速度範囲は1.0×10^<-1>〜1.0×10^<-4>s^<-1>である.組織観察は光学顕微鏡と走査型顕微鏡によった.供試材の結晶粒は軸方向に異常に長いため,粒界に働くせん断応力は事実上0である.結果は以下のように要約される.(1)773K上の温度域で超塑性が認められる.公称応力一公称歪曲線は初期のピークを経て単調に減少し,針状に尖って破談に至る.しかし,真応力はほぼ一定値を示した.(2)最大伸びは,α単相域の833Kで460%,,821Kで444%,803Kで321%である.しかし,(α+θ)共存域の673Kでは14%に激減した.(3)m値は単相域で0.3〜0.4である.温度とともに漸増傾向がある.(4)超塑性変形域ではすべり変形が一様でSEMでもすべり帯は観察されない.(5)粒界すべりの痕跡は認められない.(6)粒内変形の寄与の大きさを示す先在ボイドの伸張が認められた.

The superplasticity shows that the speed sensitivity index (m) is 0.3%. The grain boundary temperature of microcrystalline materials (mm2 0.5) is mainly affected by the high temperature deformation mechanism, the temperature condition is high, and the superplasticity is well known. On the other hand, high-temperature solute drag devices dominate the mechanical properties of Al-Mg solid solution and Al-Cu solid solution. The grain size-skew velocity table shows that the mechanical properties of the solid solution are different from those of the Classl type alloy. The results show that the grain size-skew velocity table shows that the grain size is different from that of the Classl type. The results show that the end-to-end bonding temperature (m=1/n=0.33&gt). 0.3% metal forming is expected to reach an elongation of more than 300%. In this study, the higher the temperature, the higher the atomic content, the higher the grain size, the higher the grain size and the higher the temperature of Al-Cu alloy. The results show that under the condition of ClassI dynamic test, 400% of the superplastic test shows that the test shows that the test is wrong, and the following special equipment is used to investigate the results of the test. For the material 99.99%Al, 99.9%Cu, ground gold, dissolved Al-4.5mass%Cu alloy, chemical composition Cu4.54,Si0.016,Fe0.010,Mg0.004,Zn0.004, residual Al alloy (mass%). The purpose of this paper is to introduce the manufacturing engineering of the metal plate, the horizontal connection of the metal dissolving machine (the OCC method) and the cutting process (837.2ks). The cutting machine (10mm, 4m, R) is used to distort the mechanical analysis and grinding system. The fixed speed pilot of this type of machine is used for the supply of electricity. The temperature range is 673 to 821K (0.73~0.90Tm), and the crooked velocity range is 1.0x10 ^ & lt;-1>~1.0 × 10 ^ & lt;-4> s ^ & lt;-1> temperature range. The tissue examines the optical microscopes, the walking micrographs, the microscopes. The grain temperature direction of the material is often long, and the grain boundary fracture force is 0%. Results the following temperature profiles are very important. (1) the temperature range of superplasticity at 773K is very high. The public name "force" is distorted in the initial stage. The maximum extension of the alpha phase domain is 833K, 460%, 821K, 444%, 803K, 321%, 460%, 821K, 444%, 321K, 321%. The coexisting domain of (α + θ) is 673 K (14%). (3) the phase domain of (3) m is 0.3 and 0.4, respectively. The temperature is different from the temperature. (4) the superplastic shape is in the shape of the SEM. (5) the grain boundary is marked. (6) the shape of the grain is sent to the surface of the grain. (6) the shape of the grain is sent to the surface of the grain.