Nā ʻAno Hana Loiloi Microstructure ma Metallurgy
Ma ke kahua metallurgical, he mea nui ka hoʻomaopopo ʻana i ka microstructure o nā mea metala no ka hoʻomaikaʻi ʻana i ko lākou mau waiwai mechanical a me ka hana. Hoʻopuni ka Microstructure i ka hoʻonohonoho ʻana o nā grain, nā pae, a me ka hoʻolaha ʻana a me ka haku mele ʻana o nā mea like ʻole i loko o nā metala a i ʻole nā alloys. Hāʻawi ka ʻike o ka microstructure i kahi ʻike piha o ka ikaika, ka paʻakikī, ka paʻakikī, a me ka ductility o kahi mea. No laila, he kuleana koʻikoʻi nā ʻano loiloi microstructural i ka metallurgy. E kūkākūkā kēia ʻatikala i nā ʻano hana like ʻole a me nā ʻano hana i hoʻohana ʻia e kālailai i ka microstructure i ka metallurgy.
1. Mikroskopi ʻIkepili
ʻO ka microscopy optical, i ʻike ʻia hoʻi he microscopy māmā, ʻo ia kekahi o nā ʻano hana maʻamau no ka nānā ʻana i nā microstructures. Hoʻohana kēia ʻenehana i kahi kukuna o ke kukui i kālele ʻia ma o kahi aniani e hoʻonui i ke kiʻi o kahi mea. Aia kekahi mau ʻanuʻu e pono e hahai ʻia ma mua o ka nānā ʻana me kahi microscope optical, ʻo ia hoʻi:
– Hoʻomākaukau ʻana i ka Laʻana: ʻO kēia kahua e pili ana i ka ʻoki ʻana, ke kau ʻana, ke one ʻana, a me ka hoʻowali ʻana i ka ʻili o ka laʻana e loaʻa ai kahi ʻili laumania a ʻaʻohe kahakaha.
– Ke kālai ʻana: Ma hope o ka wili ʻana, kālai pinepine ʻia ka hāpana me ka hoʻohana ʻana i kahi hopena kemika kikoʻī. ʻO ka pahuhopu o kēia kaʻina hana e hoʻomālamalama i nā palena o ka palaoa a me nā ʻano like ʻole i loaʻa i loko o ka mea.
ʻO ka microscopy optical e hiki ai iā mākou ke nānā i ka nui a me ke ʻano o ka palaoa, ka hoʻolaha ʻana o ka palaoa a me ke kuhikuhi ʻana, a me kekahi mau kīnā microstructural e like me ka porosity a i ʻole nā inclusions. ʻO ka palena o ka microscopy optical ʻo kona hoʻonā kiʻekiʻe loa, ʻo ia wale nō ma kahi o 0.2 micrometers.
2. Mikroskopika Uila
ʻOiai ua kaupalena ʻia ka microscopy optical e ka nalu o ke kukui ʻike ʻia, hoʻohana ka microscopy electron i nā kukuna electron me nā nalu pōkole loa, e hāʻawi ana i ka hoʻonā kiʻekiʻe loa. Hoʻohana pinepine ʻia ʻelua ʻano o ka microscopy electron i nā haʻawina metallurgical:
a. ʻO ka Microscopy Uila Nānā (SEM)
Hana ʻo SEM ma ka hoʻouna ʻana i kahi kukuna o nā electrons e scan ana i ka ʻili o kahi laʻana. ʻO ka launa pū ʻana o nā electrons me nā ʻātoma ma luna o ka ʻili e hana i nā hōʻailona e like me nā electrons lua, nā electrons i hoʻopuehu ʻia, a me nā kukuna X-ʻano, a laila kālailai ʻia e hana i kahi kiʻi o ka ʻili o ka mea. ʻO nā pono o SEM:
– Hoʻonā Kiʻekiʻe: Hiki ke hoʻokō i nā hoʻonā a hiki i kekahi mau nanometer.
– Ka Hohonu Nui o ke Kāohi ʻana: ʻAe i ka nānā ʻana i nā ʻili me nā ʻokoʻa contour ʻoi.
– Ka Hoʻohui Kemika: Me nā hiʻohiʻona hou aʻe e like me ka Energy Dispersive X-ray Spectroscopy (EDS), hiki i ka SEM ke kālailai i ka hoʻohui kemika ma kahi kikoʻī.
b. Ka Microscopy Uila Hoʻoili (TEM)
ʻAʻole e like me SEM, ka mea e nānā i nā ʻili, hana ʻo TEM ma ka hoʻouna ʻana i kahi kukuna uila ma o kahi hāpana lahilahi loa. Hiki iā TEM ke hāʻawi i ka ʻike kikoʻī e pili ana i nā ʻano kūloko a hiki i ka hoʻonā atomika. He mea pono loa kēia ʻano hana no:
– ʻAno Crystal: Hāʻawi i ka ʻike kikoʻī e pili ana i ka hoʻonohonoho atomika a me ka diffraction electron.
– Nā Kīnā Crystal: Ke ʻike ʻana i nā dislocations, nā palena grain, a me nā ʻāpana precipitation.
Eia nō naʻe, he paʻakikī loa ka hoʻomākaukau ʻana o ka laʻana TEM a koi ʻia ka pololei kiʻekiʻe e hōʻoia i ka mānoanoa kūpono o ka laʻana, ma ka pae maʻamau o 50-100 nm.
3. Ka Hoʻokaʻawale ʻana o ke Kukui-X (XRD)
He ʻano hana loiloi ʻo XRD i hoʻohana ʻia e hoʻoholo ai i ke ʻano kristal o kahi mea. Hoʻokumu ʻia kēia ʻano hana ma ke kumumanaʻo o ka diffraction X-ray i kona hele ʻana ma o kahi lattice kristal. Ma ke ana ʻana i ke kihi a me ka ikaika o ka diffraction hopena, hiki iā mākou ke hoʻoholo i nā mea he nui, me:
– ʻAno Crystal: ʻAno a me nā palena o ka lattice kristal a me kona kuhikuhi ʻana.
– Hoʻāʻo Pae: E ʻike i nā pae i loaʻa i loko o ka mea.
– Koena Koena: Ka nānā ʻana i ke koʻikoʻi i loaʻa i loko o kahi mea hiki ke hoʻopilikia i kāna hana mechanical.
He mea nui ʻo XRD no ka nānā ʻana i nā mea polycrystalline a he ʻano hana luku ʻole ia e hāʻawi ana i ka ʻike kikoʻī e pili ana i nā kūlana kūkulu kūloko o ka mea.
4. Ka Hoʻokaʻawale ʻana o ka Electron Backscatter (EBSD)
He ʻenehana ʻo EBSD i hoʻohana ʻia me SEM e loaʻa ai ka ʻike e pili ana i ke kuhikuhi kristal ma ka unahi micron. Ma o ka nānā ʻana i nā ʻano diffraction electron backscattered, hiki i ka EBSD ke hāʻawi i kēia ʻike:
– Ke Kuhikuhi ʻana o nā hua: Ka hoʻolaha ʻana o ke kuhikuhi ʻana o nā hua āpau ma ka wahi nānā.
– Palena Huapalaoa: ʻAno a me ka ikehu o ka palena huapalaoa.
– ʻAno: ʻOi aku ka nui o ke kuhikuhi crystallographic i nā mea polycrystalline.
He mea pono loa ʻo EBSD i ka nānā ʻana i nā mea e hana ana i ka deformation plastic, nā kaʻina hana recrystallization, a me ke kūkulu ʻana i ke ʻano i nā kaʻina hana paʻakikī metala.
5. ʻO ka Tomography Probe Atomic (APT)
He ʻenehana loea ʻo APT e hiki ai ke nānā ʻekolu-dimensional ma ka pae atomika. Hoʻohana kēia ʻenehana i kahi kahua uila ikaika e hoʻomāhu i nā ʻātoma mai ka piko o kahi nila ultratip i hoʻomākaukau ʻia mai kahi laʻana. A laila hōʻiliʻili ʻia nā ʻātoma ionized a kālailai ʻia e like me ko lākou manawa lele, e hāʻawi ana i ka ʻike e pili ana i ko lākou ʻike a me kahi. ʻO nā hoʻohana a APT:
– Ka Hoʻohui Kemika: Ka nānā ʻana o ka ʻātoma ma ka ʻātoma ma ka pololei o ka sub-nanometer.
– Ka Hoʻokaʻawale ʻAna: Palapala ʻāina i ka hoʻokaʻawale ʻana o nā mea ma ka pae atomika.
– ʻAno liʻiliʻi 3D: He ʻike piha o ka ʻano liʻiliʻi ʻekolu-dimensional.
ʻOiai hāʻawi ʻo APT i ka hoʻonā wahi kūpono ʻole, he pipiʻi kēia lako a koi aku i nā pono a me nā mākau kūikawā.
Ka hopena
ʻO ka loiloi microstructural kahi ʻano koʻikoʻi o ka metallurgy, e hiki ai iā mākou ke hoʻomaopopo a hoʻomaikaʻi i nā waiwai o nā mea metala. Hāʻawi nā ʻano hana like ʻole, mai ka microscopy optical a i nā ʻenehana holomua e like me APT, i nā manaʻo like ʻole no ka nānā ʻana i ka microstructure. Loaʻa i kēlā me kēia ʻano hana kona mau pono a me nā palena, a ʻo ke koho ʻana i ke ʻano hana kūpono e hilinaʻi nui ʻia i ka pilikia kikoʻī ma ka lima a me ka pae kikoʻī i makemake ʻia. Ma ka hoʻomaopopo ʻana a me ka hoʻokō ʻana i kēia mau ʻano hana, hiki iā mākou ke hoʻolālā maikaʻi, hana, a hoʻopili i nā mea metala i nā noi ʻoihana like ʻole.
Ma o ka hoʻohana ʻana i ka ʻenehana loiloi microstructural, hiki ke hoʻokō ʻia ka hana hou i nā mea metala, no laila e hāʻawi nui ana i ka holomua o ka ʻenehana mea a me ka hoʻomaikaʻi ʻana i ka maikaʻi o ka huahana.
