本文關(guān)鍵詞： Al-Si-Mg鋁合金 拉伸性能 應(yīng)變硬化 析出相 時(shí)效處理 模擬　出處：《金屬學(xué)報(bào)》2017年09期 　論文類型：期刊論文

【摘要】：建立了時(shí)效析出動(dòng)力學(xué)模型、強(qiáng)化模型以及應(yīng)變硬化模型,針對(duì)Al-7Si-Mg合金開展拉伸性能模擬研究。時(shí)效析出動(dòng)力學(xué)模型可以模擬析出相密度、尺寸、分布、體積分?jǐn)?shù)、基體中元素含量等微觀組織參數(shù),并結(jié)合強(qiáng)化模型獲得合金的屈服強(qiáng)度。通過應(yīng)變硬化模型可模擬合金在拉伸過程的應(yīng)力-應(yīng)變曲線,并結(jié)合關(guān)系式(σ_(UTS)-σ_Y)=m·σ_Y+n+f(T_(ss))獲得合金的抗拉強(qiáng)度和延伸率。本工作首先模擬了Al-7Si-0.4Mg合金的析出相特征參數(shù)及屈服強(qiáng)度并進(jìn)行實(shí)驗(yàn)驗(yàn)證,分析了模擬結(jié)果與實(shí)驗(yàn)結(jié)果之間存在偏差的可能原因。采用應(yīng)變硬化模型模擬了Al-7Si-0.36Mg合金在拉伸過程的應(yīng)力-應(yīng)變曲線,分析時(shí)效處理和鑄態(tài)組織細(xì)化程度對(duì)位錯(cuò)存儲(chǔ)速率、動(dòng)態(tài)回復(fù)速率及合金的應(yīng)力-應(yīng)變曲線的影響規(guī)律。采用本模型預(yù)測(cè)了Al-7Si-0.4Mg合金在不同時(shí)效溫度下的抗拉強(qiáng)度和延伸率,并與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比,分析了二次枝晶臂間距對(duì)拉伸性能的影響。最后,對(duì)模型存在的局限性及影響拉伸性能預(yù)測(cè)精度的因素進(jìn)行了分析。
[Abstract]:The aging precipitation kinetics model, strengthening model and strain hardening model are established. The tensile properties of Al-7Si-Mg alloy are simulated. The aging precipitation kinetic model can simulate the precipitation phase density. The microstructure parameters, such as size, distribution, volume fraction and element content in matrix, were used to obtain the yield strength of the alloy. The stress-strain curve of the alloy in the tensile process could be simulated by the strain hardening model. And combined with the relational formula (蟽-蟽 Yam 路蟽 Y n ft / T / T / n). The tensile strength and elongation of the alloy were obtained. The characteristic parameters of precipitate phase and yield strength of Al-7Si-0.4Mg alloy were simulated and verified by experiments. The possible reasons for the deviation between the simulation results and the experimental results were analyzed. The stress-strain curves of Al-7Si-0.36Mg alloy during tensile process were simulated by strain hardening model. The effect of aging treatment and as-cast structure refinement on the dislocation storage rate was analyzed. The influence of dynamic recovery rate and stress-strain curve of Al-7Si-0.4Mg alloy was studied. The tensile strength and elongation of Al-7Si-0.4Mg alloy at different aging temperature were predicted by this model. Compared with the experimental results, the influence of secondary dendritic arm spacing on tensile properties is analyzed. Finally, the limitations of the model and the factors affecting the precision of tensile properties prediction are analyzed.
【作者單位】： 清華大學(xué)材料學(xué)院先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室;明志科技有限公司;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目No.2011CB706801 國(guó)家自然科學(xué)基金項(xiàng)目Nos.51374137和51171089~~
【分類號(hào)】：TG146.21
【正文快照】： the ultimate tensile strengths and elongations can be obtained by combining this model with the experi-mental data fitted with the expression(sUTS-sY)=m·sY+n+f(Tss).First,the evolution of precipitate microstruc-ture parameters and yield strengths as a f

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊澤斌;朱定一;易煒發(fā);林淑梅;;碳含量對(duì)Fe-Ni-Mn-Si-C系TWIP鋼應(yīng)變硬化行為的影響[J];鋼鐵;2011年09期

2 王長(zhǎng)壽;南服周;程渝淋;;不銹鋼薄板應(yīng)變硬化規(guī)律與冪指數(shù)式的擬合程度[J];冶金分析與測(cè)試(冶金物理測(cè)試分冊(cè));1985年04期

3 徐振;殷鳳仕;薛冰;田麗倩;;低碳鋼在恒速率變形條件下的應(yīng)變硬化行為研究[J];熱加工工藝;2011年04期

4 張旺峰,盧正欣,陳瑜眉,朱金華;組織結(jié)構(gòu)對(duì)應(yīng)變硬化的影響[J];機(jī)械工程材料;2002年10期

5 那順桑;陳斌鍇;;18-8型不銹鋼的應(yīng)變硬化特性研究[J];理化檢驗(yàn)(物理分冊(cè));2007年02期

6 蔡志輝;辛U_斌;孔輝;丁樺;;Fe-11Mn-4Al-0.2C鋼的應(yīng)變硬化行為[J];東北大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年12期

7 盧國(guó)鑫;王仁智;陸峰;;300M鋼表面強(qiáng)化后應(yīng)變硬化特性的表征[J];金屬熱處理;2014年04期

8 蔡輝;;5052鋁合金板材的應(yīng)變硬化行為模型探討[J];鋁加工;2014年03期

9 余海燕;;金屬薄板應(yīng)變硬化模型比較分析[J];鍛壓技術(shù);2012年05期

10 何俊;劉偉;陸培德;邵立;;應(yīng)變硬化對(duì)冷軋301L不銹鋼點(diǎn)焊接頭疲勞強(qiáng)度的影響[J];機(jī)械工程材料;2007年04期

相關(guān)會(huì)議論文 前4條

1 范秀昌;吳月明;;空間與物質(zhì)描述下應(yīng)變硬化模量的測(cè)量與計(jì)算[A];第五屆全國(guó)結(jié)構(gòu)工程學(xué)術(shù)會(huì)議論文集（第一卷）[C];1996年

2 李永強(qiáng);祝連春;劉W，

本文編號(hào)：1449394